The document lists the element symbols of all 118 known elements in the periodic table, organized by their atomic number from 1 to 118. No other information is provided about the elements.
The document contains a series of questions and answers about chemistry concepts like electron configurations, noble gas configurations, and atom to element ratios. It reviews elements like chlorine, sodium, iron, bromine, barium, neptunium, cobalt, silver, tellurium, radium, and ruthenium. It also addresses common errors in writing electron configurations and calculates atom to element ratios for compounds like H2O, H2SO4, C6H12O6, and KClO3.
The document lists the element symbols of all 118 known elements in the periodic table, organized by their atomic number from 1 to 118. No other information is provided about the elements.
The #6 Lady Buffs softball team will travel to Stephenville, Texas to face the Tarleton State TexAnns in a three-game Lone Star Conference series from March 3-4. Tarleton State enters the series with a 12-9 overall record and 3-3 in conference play, while West Texas A&M is 17-2 overall and 3-0 in conference play. The Lady Buffs lead the all-time series against Tarleton State 20-16 and have won the last four meetings.
The document provides game notes for the #7 West Texas A&M Lady Buffs softball team. It summarizes their recent games and statistics. It also provides information about their upcoming three-game series against Texas Woman's University, including statistics for Texas Woman's team. The Lady Buffs lead the overall series against TWU 24-22 and will host them at Schaeffer Park on February 24-25.
The 2017 Lady Buff Softball Spring Break Skills Camp will take place on March 13th and 14th for ages 6-8 and 9-12 respectively. Campers will receive instruction from collegiate coaches and players in offensive, defensive, pitching and catching skills. The $40 camp fee is due by March 12th and space is limited to the first 60 registrants. Campers should bring their own equipment and additional walk-up fees may apply.
The West Texas A&M Buffaloes will face the Texas A&M-Kingsville Javelinas in the quarterfinal round of the 2017 Lone Star Conference Men's Basketball Championship on Friday. WT is the third seed with a 24-7 record while TAMUK enters as the sixth seed at 17-10. In their last meeting on February 16th, TAMUK defeated WT 76-59 on their home court, snapping a nine-game winning streak for WT in the series. The winner will advance to the semifinal round on Saturday.
Este documento trata sobre los riesgos volcánicos en las Islas Canarias. Explica que Canarias es una zona volcánica intraplaca con numerosos volcanes activos que representan un importante riesgo. Describe algunos de los volcanes más importantes como el Teide en Tenerife y explica los diversos peligros asociados a la actividad volcánica como la expulsión de piroclastos y la emisión de gases. Además, resume brevemente algunas de las teorías sobre el origen geológico del arch
The West Texas A&M Buffaloes conclude their regular season schedule on Saturday afternoon hosting the #15 Tarleton State Texans. Tarleton State enters with a 22-5 record and is led by head coach Lonn Reisman, who has over 600 career wins. The Texans are led offensively by Ridell Camidge averaging 15.4 points per game. In their last meeting, Tarleton State defeated West Texas A&M 91-73. A win would give West Texas A&M a 25-24 edge in the all-time series between the teams.
The document contains a series of questions and answers about chemistry concepts like electron configurations, noble gas configurations, and atom to element ratios. It reviews elements like chlorine, sodium, iron, bromine, barium, neptunium, cobalt, silver, tellurium, radium, and ruthenium. It also addresses common errors in writing electron configurations and calculates atom to element ratios for compounds like H2O, H2SO4, C6H12O6, and KClO3.
The document lists the element symbols of all 118 known elements in the periodic table, organized by their atomic number from 1 to 118. No other information is provided about the elements.
The #6 Lady Buffs softball team will travel to Stephenville, Texas to face the Tarleton State TexAnns in a three-game Lone Star Conference series from March 3-4. Tarleton State enters the series with a 12-9 overall record and 3-3 in conference play, while West Texas A&M is 17-2 overall and 3-0 in conference play. The Lady Buffs lead the all-time series against Tarleton State 20-16 and have won the last four meetings.
The document provides game notes for the #7 West Texas A&M Lady Buffs softball team. It summarizes their recent games and statistics. It also provides information about their upcoming three-game series against Texas Woman's University, including statistics for Texas Woman's team. The Lady Buffs lead the overall series against TWU 24-22 and will host them at Schaeffer Park on February 24-25.
The 2017 Lady Buff Softball Spring Break Skills Camp will take place on March 13th and 14th for ages 6-8 and 9-12 respectively. Campers will receive instruction from collegiate coaches and players in offensive, defensive, pitching and catching skills. The $40 camp fee is due by March 12th and space is limited to the first 60 registrants. Campers should bring their own equipment and additional walk-up fees may apply.
The West Texas A&M Buffaloes will face the Texas A&M-Kingsville Javelinas in the quarterfinal round of the 2017 Lone Star Conference Men's Basketball Championship on Friday. WT is the third seed with a 24-7 record while TAMUK enters as the sixth seed at 17-10. In their last meeting on February 16th, TAMUK defeated WT 76-59 on their home court, snapping a nine-game winning streak for WT in the series. The winner will advance to the semifinal round on Saturday.
Este documento trata sobre los riesgos volcánicos en las Islas Canarias. Explica que Canarias es una zona volcánica intraplaca con numerosos volcanes activos que representan un importante riesgo. Describe algunos de los volcanes más importantes como el Teide en Tenerife y explica los diversos peligros asociados a la actividad volcánica como la expulsión de piroclastos y la emisión de gases. Además, resume brevemente algunas de las teorías sobre el origen geológico del arch
The West Texas A&M Buffaloes conclude their regular season schedule on Saturday afternoon hosting the #15 Tarleton State Texans. Tarleton State enters with a 22-5 record and is led by head coach Lonn Reisman, who has over 600 career wins. The Texans are led offensively by Ridell Camidge averaging 15.4 points per game. In their last meeting, Tarleton State defeated West Texas A&M 91-73. A win would give West Texas A&M a 25-24 edge in the all-time series between the teams.
chemical bonding power point presentation is all about the electron configuration, the s, p, d, f and orbital notation. This also contains information about the ionic and covalent bonding. This also includes bonding between metals to non-metals and non-metals to non-metals. This also describes an atom and its parts and regions. You can also be familiarized with the periodic table of elements where groups and periods are being describe. This also describes the location of an atom. the location of protons, nuetrons, and electrons.
The document discusses the periodic table of elements. It provides details on:
1) The organization of the modern periodic table, including the arrangement of elements by atomic number into groups and periods, and classification of elements as metals, nonmetals, and metalloids.
2) Properties of metals and nonmetals, including their physical states, conductivity, luster, malleability/ductility, and chemical behaviors of gaining/losing electrons to form ions.
3) Specific groups highlighted including Group 1A alkali metals, Group 2A alkaline earth metals, and Group 7A halogens.
The document discusses the element silicon. It provides the symbol Si, atomic number 14, and describes silicon as a hard, brittle crystalline solid with a blue-grey metallic lustre. It also briefly outlines the discovery of silicon by Jöns Jacob Berzelius in 1824 and mentions some of silicon's physical properties, including its allotropes, atomic number, density, melting and boiling points.
This document is the periodic table of elements in Spanish. It contains 118 elements arranged in blocks by their atomic number. The first block contains the first 18 elements including hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, neon and others. Below that are additional blocks containing the remaining 100 elements such as calcium, scandium, titanium, vanadium and others up to oganesson. Within the periodic table, the lanthanide and actinide series of elements are designated with symbols.
This document discusses the periodic trends in covalent and ionic radii. It defines covalent radius as half the distance between two covalently bonded atoms. Covalent radii generally decrease down a group and increase across a period. Ionic radius is defined as the distance between the centers of neighboring cations and anions in an ionic bond. Ionic radii decrease down a group for cations and increase down a group for anions. Ionic radii also generally decrease with higher charges on the cation. Coordination number can also affect ionic radii, with larger numbers associated with larger radii.
The document discusses the basics of atoms and elements. It explains that all matter is composed of tiny indivisible particles called atoms. Atoms of the same element have the same number of protons and are arranged on the periodic table according to their atomic number. The periodic table classifies elements into groups with similar chemical properties and provides each element's symbol and atomic number.
The document is a periodic table listing the elements in order of atomic number from 1 to 118. It includes the element symbol, atomic mass, and occasionally the name of each element. The periodic table shows that elements are organized into blocks by their atomic structure and properties, with elements with similar properties listed in the same column. Elements are also grouped into rows called periods based on their electron configurations.
This document is a class schedule for SMK WongSorejo Gombong high school for the 2019/2020 academic year. It lists the classes, teachers, subjects, and times for each day of the week from Monday to Saturday. It includes the names of all classes from grades XI to XII and the subjects being taught each period along with the teachers' names. The schedule is in effect starting July 15, 2019 and is signed by the school principal.
chemical bonding power point presentation is all about the electron configuration, the s, p, d, f and orbital notation. This also contains information about the ionic and covalent bonding. This also includes bonding between metals to non-metals and non-metals to non-metals. This also describes an atom and its parts and regions. You can also be familiarized with the periodic table of elements where groups and periods are being describe. This also describes the location of an atom. the location of protons, nuetrons, and electrons.
The document discusses the periodic table of elements. It provides details on:
1) The organization of the modern periodic table, including the arrangement of elements by atomic number into groups and periods, and classification of elements as metals, nonmetals, and metalloids.
2) Properties of metals and nonmetals, including their physical states, conductivity, luster, malleability/ductility, and chemical behaviors of gaining/losing electrons to form ions.
3) Specific groups highlighted including Group 1A alkali metals, Group 2A alkaline earth metals, and Group 7A halogens.
The document discusses the element silicon. It provides the symbol Si, atomic number 14, and describes silicon as a hard, brittle crystalline solid with a blue-grey metallic lustre. It also briefly outlines the discovery of silicon by Jöns Jacob Berzelius in 1824 and mentions some of silicon's physical properties, including its allotropes, atomic number, density, melting and boiling points.
This document is the periodic table of elements in Spanish. It contains 118 elements arranged in blocks by their atomic number. The first block contains the first 18 elements including hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, neon and others. Below that are additional blocks containing the remaining 100 elements such as calcium, scandium, titanium, vanadium and others up to oganesson. Within the periodic table, the lanthanide and actinide series of elements are designated with symbols.
This document discusses the periodic trends in covalent and ionic radii. It defines covalent radius as half the distance between two covalently bonded atoms. Covalent radii generally decrease down a group and increase across a period. Ionic radius is defined as the distance between the centers of neighboring cations and anions in an ionic bond. Ionic radii decrease down a group for cations and increase down a group for anions. Ionic radii also generally decrease with higher charges on the cation. Coordination number can also affect ionic radii, with larger numbers associated with larger radii.
The document discusses the basics of atoms and elements. It explains that all matter is composed of tiny indivisible particles called atoms. Atoms of the same element have the same number of protons and are arranged on the periodic table according to their atomic number. The periodic table classifies elements into groups with similar chemical properties and provides each element's symbol and atomic number.
The document is a periodic table listing the elements in order of atomic number from 1 to 118. It includes the element symbol, atomic mass, and occasionally the name of each element. The periodic table shows that elements are organized into blocks by their atomic structure and properties, with elements with similar properties listed in the same column. Elements are also grouped into rows called periods based on their electron configurations.
This document is a class schedule for SMK WongSorejo Gombong high school for the 2019/2020 academic year. It lists the classes, teachers, subjects, and times for each day of the week from Monday to Saturday. It includes the names of all classes from grades XI to XII and the subjects being taught each period along with the teachers' names. The schedule is in effect starting July 15, 2019 and is signed by the school principal.
2. Printable Periodic Tables
All of the following tables are in Acrobat PDF format. To view and print these
files, you will need to install the free Adobe Acrobat Reader program on your
computer. The program can be downloaded from the Adobe Website.
Click on the element symbol to download the PDF file.
http://www.sciencegeek.net/index.html
Click
Here
13. P
Zn As
Sb
Pt Bi
Midd. -1700
Cr Mn
Li
K
N O F
Na
BBe
H
Al Si Cl
Ca Ti V Co Ni Se Br
Sr Y Zr Nb Mo Rh Pd Cd Te I
Ba Ta W Os Ir
Mg
Ce Tb Er
Th U
1735-1843
Discovering the Periodic Table
C
S
Fe Cu
Ag Sn
Au Hg Pb
Ancient Times
He
Sc Ga Ge
Rb Ru In
Cs Tl
Pr Nd Sm Gd Dy Ho Tm Yb
La
1843-1886
Ne
Ar
Kr
Xe
Po Rn
Ra
Eu Lu
Pa
Ac
1894-1918
Tc
Hf Re At
Fr
Pm
Np Pu Am Cm Bk Cf Es Fm Md No Lr
1923-1961
Rf Db Sg Bh Hs Mt
1965-
Journal of Chemical Education, Sept. 1989
24. 1
2
3
4
5
6
7
s
d
p
s
f
*
W
W
*
Electron Filling in Periodic Table
Li
2s1
H
1s1
He
1s2
C
2p2
N
2p3
O
2p4
F
2p5
Ne
2p6
Na
3s1
B
2p1
Be
2s2
H
1s1
Al
3p1
Si
3p2
P
3p3
S
3p4
Cl
3p5
Ar
3p6
K
4s1
Ca
4s2
Sc
3d1
Ti
3d2
V
3d3
Cr
3d5
Mn
3d5
Fe
3d6
Co
3d7
Ni
3d8
Cu
3d10
Zn
3d10
Ga
4p1
Ge
4p2
As
4p3
Se
4p4
Br
4p5
Kr
4p6
Rb
5s1
Sr
5s2
Y
4d1
Zr
4d2
Nb
4d4
Mo
4d5
Tc
4d6
Ru
4d7
Rh
4d8
Pd
4d10
Ag
4d10
Cd
4p1
In
5p1
Sn
5p2
Sb
5p3
Te
5p4
I
5p5
Xe
5p6
Cs
6s1
Ba
6s2
Hf
5d2
Ta
5d3
W
5d4
Re
5d5
Os
5d6
Ir
5d7
Pt
5d9
Au
5d10
Hg
5d10
Tl
6p1
Pb
6p2
Bi
6p3
Po
6p4
At
6p5
Rn
6p6
Fr
7s1
Ra
7s2
Rf
6d2
Db
6d3
Sg
6d4
Bh
6d5
Hs
6d6
Mt
6d7
Mg
3s2
Ce
4f2
Pr
4f3
Nd
4f4
Pm
4f5
Sm
4f6
Eu
4f7
Gd
4f7
Tb
4f9
Dy
4f10
Ho
4f11
Er
4f12
Tm
4f13
Yb
4f14
Lu
4f114
Th
6d2
Pa
5f2
U
5f3
Np
5f4
Pu
5f6
Am
5f7
Cm
5f7
Bk
5f8
Cf
5f10
Es
5f11
Fm
5f14
Md
5f13
No
5f14
Lr
5f14
La
5d1
Ac
6d1
1
2
3
4
5
6
7
s
d
p
s
f
*
W
W
*
25. Atomic Radii
Li
Na
K
Rb
Cs
ClSPSiAl
BrSeAsGeGa
ITeSbSnIn
Tl Pb Bi
Mg
Ca
Sr
Ba
Be FONCB
1.52 1.11
1.86 1.60
2.31 1.97
2.44 2.15
2.62 2.17
0.88 0.77 0.70 0.66 0.64
1.43 1.17 1.10 1.04 0.99
1.22 1.22 1.21 1.17 1.14
1.62 1.40 1.41 1.37 1.33
1.71 1.75 1.46
IA IIA IIIA IVA VA VIA VIIA
= 1 Angstrom
26. Atomic Radii of Representative Elements (nm)
LeMay Jr, Beall, Robblee, Brower, Chemistry Connections to Our Changing World , 1996, page 175
Li
Na
K
Rb
Cs
ClSPSiAl
BrSeAsGeGa
ITeSbSnIn
Tl Pb Bi
Mg
Ca
Sr
Ba
Be FONCB
0.1.52 0.111
0.186 0.160
0.231 0.197
0.244 0.215
0.262 0.217
0.088 0.077 0.070 0.066 0.064
0.143 0.117 0.110 0.104 0.099
0.122 0.122 0.121 0.117 0.114
0.162 0.140 0.141 0.137 0.133
0.171 0.175 0.146 0.140 0.140
1A 2A 3A 4A 5A 6A 7A
At
Po
27. Atomic Radii
Li
Na
K
Rb
Cs
ClSPSiAl
BrSeAsGeGa
ITeSbSnIn
Tl Pb Bi
Mg
Ca
Sr
Ba
Be FONCB
1.52 1.11
1.86 1.60
2.31 1.97
2.44 2.15
2.62 2.17
0.88 0.77 0.70 0.66 0.64
1.43 1.17 1.10 1.04 0.99
1.22 1.22 1.21 1.17 1.14
1.62 1.40 1.41 1.37 1.33
1.71 1.75 1.46
IA IIA IIIA IVA VA VIA VIIA
= 1 Angstrom
0.60 0.31
0.95 0.65
1.33 0.99
1.48 1.13
1.69 1.35
1.71 1.40 1.36
0.50 1.84 1.81
0.62 1.98 1.85
0.81 2.21 2.16
0.95
IA IIA IIIA IVA VA VIA VIIA
= 1 Angstrom
Li1+ Be2+
Na1+ Mg2+
Ba2+
Sr2+
Ca2+K1+
Rb1+
Cs1+
Cl1-
N3-
O2- F1-
S2-
Se2- Br1-
Te2- I1-
Al3+
Ga3+
In3+
Tl3+
Ionic Radii
29. First Ionization Energies
(in kilojoules per mole)
H
1312.1
Li
520.3
Na
495.9
K
418.9
Be
899.5
Mg
737.8
Ca
589.9
B
800.7
Al
577.6
Ga
578.6
C
1086.5
Si
786.5
Ge
761.2
N
1402.4
P
1011.8
As
946.5
O
1314.0
S
999.7
Se
940.7
F
1681.1
Cl
1251.2
Br
1142.7
Ne
2080.8
Ar
1520.6
Kr
1350.8
He
2372.5
Rb
402.9
Sr
549.2
In
558.2
Sn
708.4
Sb
833.8
Te
869.0
I
1008.7
Xe
1170.3
Smoot, Price, Smith, Chemistry A Modern Course 1987, page 188
34. Oxidation State of Elements
Se2-
Te2-
1
2
3
4
5
6
1
2
3
4
5
6
Al3+
Zn2+
Ag1+
N3- O2- F1-
Cl1-S2-
Br1-
I1-
Period
Be2+
Na+
K+
Rb+
Cs+ Ba2+
H+
Li+
Ca2+
Sr2+
Mg2+
Group 1
2 13 14 15 16 17
18
N
O
B
L
E
G
A
S
E
S
Transition metals
35. Orbitals Being Filled
1
3 4 5 6 7
Groups 8
2
F1-
Br1-
I1-
Cl1-
Transition metals form cations
with various charges.
O2-
S2-
Se2-
Te2-
Be2+
Te2-
Te2-
Te2-
Te2-
Li1+
Na1+
K1+
Rb1+
Cs1+
Al3+
Ga3+
In3+
Zn2+
Ag1+
38. 1
H
Hydrogen
Name: Hydrogen
Symbol: H
Atomic Number: 1
Atomic Mass: 1.00794 amu
Melting Point: -259.14 °C (14.009985 °K, -434.45203 °F)
Boiling Point: -252.87 °C (20.280005 °K, -423.166 °F)
Electron Configuration
N
H = 1s1
Hydrogen
What is Hydrogen?
Colorless, odorless gaseous chemical element. Lightest
and most abundant element in the universe. Present in
water and in all organic compounds. Chemically reacts
with most elements. Discovered by Henry Cavendish in
1776.
39. pslawinski, metal-halide.net
Name: Helium
Symbol: He
Atomic Number: 2
Atomic Mass: 4.002602 amu
Melting Point: -272.0 °C (1.15 °K, -457.6 °F)
Boiling Point: -268.6 °C (4.549994 °K, -451.48 °F)
N
Helium
Electron Configuration
He = 1s2
2
He
Helium
What is Helium?
Colorless, odorless gaseous nonmetallic element.
Belongs to group 18 of the periodic table. Lowest
boiling point of all elements and can only be solidified
under pressure. Chemically inert, no known
compounds. Discovered in the solar spectrum in 1868
by Lockyer.
40. 3
Li
Lithium
Name: Lithium
Symbol: Li
Atomic Number: 3
Atomic Mass: 6.941 amu
Melting Point: 180.54 °C (453.69 °K, 356.972 °F)
Boiling Point: 1347.0 °C (1620.15 °K, 2456.6 °F)
N
Lithium
Electron Configuration
Li = 1s22s1
What is Lithium?
Socket silvery metal. First member of group 1 of the
periodic table. Lithium salts are used in
psychomedicine.
41. 4
Be
Beryllium
Name: Beryllium
Symbol: Be
Atomic Number: 4
Atomic Mass: 9.012182 amu
Melting Point: 1278.0 °C (1551.15 °K, 2332.4 °F)
Boiling Point: 2970.0 °C (3243.15 °K, 5378.0 °F)
N
Beryllium
Electron Configuration
Be = 1s22s2
What is Beryllium?
Grey metallic element of group 2 of the periodic table.
Is toxic and can cause severe lung diseases and
dermatitis. Shows high covalent character. It was
isolated independently by F. Wohler and A.A. Bussy in
1828.
42. 5
B
Boron
Name: Boron
Symbol: B
Atomic Number: 5
Atomic Mass: 10.811 amu
Melting Point: 2300.0 °C (2573.15 °K, 4172.0 °F)
Boiling Point: 2550.0 °C (2823.15 °K, 4622.0 °F)
N
Boron
Electron Configuration
B = 1s22s22p1
What is Boron?
An element of group 13 of the periodic table. There are two
allotropes, amorphous boron is a brown power, but metallic boron
is black. The metallic form is hard (9.3 on Mohs' scale) and a bad
conductor in room temperatures. It is never found free in nature.
Boron-10 is used in nuclear reactor control rods and shields. It was
discovered in 1808 by Sir Humphry Davy and by J.L. Gay-Lussac
and L.J. Thenard.
43. 6
C
Carbon
Name: Carbon
Symbol: C
Atomic Number: 6
Atomic Mass: 12.0107 amu
Melting Point: 3500.0 °C (3773.15 °K, 6332.0 °F)
Boiling Point: 4827.0 °C (5100.15 °K, 8720.6 °F)
N
Carbon
Electron Configuration
C = 1s22s22p2
What is Carbon?
Carbon is a member of group 14 of the periodic table. It has
three allotropic forms of it, diamonds, graphite and fullerite.
Carbon-14 is commonly used in radioactive dating. Carbon
occurs in all organic life and is the basis of organic chemistry.
Carbon has the interesting chemical property of being able to
bond with itself, and a wide variety of other elements.
44. 7
N
Nitrogen
Name: Nitrogen
Symbol: N
Atomic Number: 7
Atomic Mass: 14.00674 amu
Melting Point: -209.9 °C (63.250008 °K, -345.81998 °F)
Boiling Point: -195.8 °C (77.35 °K, -320.44 °F)
N
Nitrogen
Electron Configuration
N = 1s22s22p3
Link
What is Nitrogen?
Colorless, gaseous element which belongs to group 15 of the
periodic table. Constitutes ~78% of the atmosphere and is an
essential part of the ecosystem. Nitrogen for industrial purposes
is acquired by the fractional distillation of liquid air. Chemically
inactive, reactive generally only at high temperatures or in
electrical discharges. It was discovered in 1772 by D. Rutherford.
45. 8
O
Oxygen
Name: Oxygen
Symbol: O
Atomic Number: 8
Atomic Mass: 15.9994 amu
Melting Point: -218.4 °C (54.75 °K, -361.12 °F)
Boiling Point: -183.0 °C (90.15 °K, -297.4 °F)
N
Oxygen
Electron Configuration
O = 1s22s22p4
What is Oxygen?
A colorless, odorless gaseous element belonging to group 16 of
the periodic table. It is the most abundant element present in the
earth's crust. It also makes up 20.8% of the Earth's atmosphere.
For industrial purposes, it is separated from liquid air by
fractional distillation. It is used in high temperature welding, and
in breathing. It commonly comes in the form of Oxygen, but is
found as Ozone in the upper atmosphere. It was discovered by
Priestley in 1774.
46. 9
F
Fluorine
Name: Fluorine
Symbol: F
Atomic Number: 9
Atomic Mass: 18.998404 amu
Melting Point: -219.62 °C (53.53 °K, -363.316 °F)
Boiling Point: -188.14 °C (85.01 °K, -306.652 °F)
N
Fluorine
Electron Configuration
F = 1s22s22p5
What is Fluorine?
A poisonous pale yellow gaseous element belonging to
group 17 of the periodic table (The halogens). It is the
most chemically reactive and electronegative element.
It is highly dangerous, causing severe chemical burns
on contact with flesh. Fluorine was identified by
Scheele in 1771 and first isolated by Moissan in 1886.
47. pslawinski, wikipedia.org
Name: Neon
Symbol: Ne
Atomic Number: 10
Atomic Mass: 20.1797 amu
Melting Point: -248.6 °C (24.549994 °K, -415.48 °F)
Boiling Point: -246.1 °C (27.049994 °K, -410.98 °F)
N
Neon
Electron Configuration
Ne = 1s22s22p6
10
Ne
Neon
What is Neon?
Colorless gaseous element of group 18 on the periodic
table (noble gases). Neon occurs in the atmosphere,
and comprises 0.0018% of the volume of the
atmosphere. It has a distinct reddish glow when used in
discharge tubes and neon based lamps. It forms almost
no chemical compounds. Neon was discovered in 1898
by Sir William Ramsey and M.W. Travers.
48. Name: Sodium
Symbol: Na
Atomic Number: 11
Atomic Mass: 22.98977 amu
Melting Point: 97.8 °C (370.95 °K, 208.04001 °F)
Boiling Point: 552.9 °C (826.05005 °K, 1027.2201 °F)
N
Sodium
Electron Configuration
Na = 1s22s22p63s1
11
Na
Sodium
What is Sodium?
Soft silvery reactive element belonging to group 1 of the
periodic table (alkali metals). It is highly reactive,
oxidizing in air and reacting violently with water, forcing
it to be kept under oil. It was first isolated by Humphrey
Davy in 1807.
49. Name: Magnesium
Symbol: Mg
Atomic Number: 12
Atomic Mass: 24.305 amu
Melting Point: 650.0 °C (923.15 °K, 1202.0 °F)
Boiling Point: 1107.0 °C (1380.15 °K, 2024.6 °F)
N
Magnesium
Electron Configuration
Mg = 1s22s22p63s2
Link
12
MgMagnesium
What is Magnesium?
Silvery metallic element belonging to group 2 of the
periodic table (alkaline-earth metals). It is essential for
living organisms, and is used in a number of light alloys.
Chemically very reactive, it forms a protective oxide
coating when exposed to air and burns with an intense
white flame. It also reacts with sulphur, nitrogen and the
halogens. First isolated by Bussy in 1828.
50. Name: Aluminum
Symbol: Al
Atomic Number: 13
Atomic Mass: 26.981539 amu
Melting Point: 660.37 °C (933.52 °K, 1220.666 °F)
Boiling Point: 2467.0 °C (2740.15 °K, 4472.6 °F)
N
Aluminum
Electron Configuration
Al = 1s22s22p63s23p1
13
Al
Aluminum
What is Aluminum?
Silvery-white lustrous metallic element of group 3 of the
periodic table. Highly reactive but protected by a thin
transparent layer of the oxide which quickly forms in air.
There are many alloys of aluminum, as well as a good
number of industrial uses. Makes up 8.1% of the Earth's
crust, by weight. Isolated in 1825 by H.C. Oersted.
51. Name: Silicon
Symbol: Si
Atomic Number: 14
Atomic Mass: 28.0855 amu
Melting Point: 1410.0 °C (1683.15 °K, 2570.0 °F)
Boiling Point: 2355.0 °C (2628.15 °K, 4271.0 °F)
N
Silicon
Electron Configuration
Si = 1s22s22p63s23p2
Link
14
Si
Silicon
What is Silicon?
Metalloid element belonging to group 14 of the
periodic table. It is the second most abundant
element in the Earth's crust, making up 25.7% of it
by weight. Chemically less reactive than carbon.
First identified by Lavoisier in 1787 and first isolated
in 1823 by Berzelius.
52. Name: Phosphorus
Symbol: P
Atomic Number: 15
Atomic Mass: 30.97376 amu
Melting Point: 44.1 °C (317.25 °K, 111.38 °F)
Boiling Point: 280.0 °C (553.15 °K, 536.0 °F)
N
Phosphorus
Electron Configuration
P = 1s22s22p63s23p3
15
PPhosphorus
What is Phosphorus?
Non-metallic element belonging to group 15 of
the periodic table. Has a multiple allotropic
forms. Essential element for living organisms.
It was discovered by Brandt in 1669.
53. Name: Sulfur
Symbol: S
Atomic Number: 16
Atomic Mass: 32.066 amu
Melting Point: 112.8 °C (385.95 °K, 235.04001 °F)
Boiling Point: 444.6 °C (717.75 °K, 832.28 °F)
N
Sulfur
Electron Configuration
S = 1s22s22p63s23p4
16
S
Sulfur
What is Sulfur?
Yellow, nonmetallic element belonging to group 16
of the periodic table. It is an essential element in
living organisms, needed in the amino acids
cysteine and methionine, and hence in many
proteins. Absorbed by plants from the soil as
sulfate ion.
54. Name: Chlorine
Symbol: Cl
Atomic Number: 17
Atomic Mass: 35.4527 amu
Melting Point: -100.98 °C (172.17 °K, -149.764 °F)
Boiling Point: -34.6 °C (238.55 °K, -30.279997 °F)
N
Chlorine
Electron Configuration
Cl = 1s22s22p63s23p5
17
Cl
Chlorine
What is Chlorine?
Halogen element. Poisonous greenish-yellow gas.
Occurs widely in nature as sodium chloride in
seawater. Reacts directly with many elements and
compounds, strong oxidizing agent. Discovered by
Karl Scheele in 1774. Humphrey David confirmed
it as an element in 1810.
55. Name: Argon
Symbol: Ar
Atomic Number: 18
Atomic Mass: 39.948 amu
Melting Point: -189.3 °C (83.85 °K, -308.74 °F)
Boiling Point: -186.0 °C (87.15 °K, -302.8 °F)
N
Argon
Electron Configuration
Ar = 1s22s22p63s23p6
18
Ar
Argon
What is Argon?
Monatomic noble gas. Makes up 0.93% of the
air. Colorless, odorless. Is inert and has no true
compounds. Lord Rayleigh and Sir William
Ramsey identified argon in 1894.
pslawinski, wikipedia.org
56. Name: Potassium
Symbol: K
Atomic Number: 19
Atomic Mass: 39.0983 amu
Melting Point: 63.65 °C (336.8 °K, 146.57 °F)
Boiling Point: 774.0 °C (1047.15 °K, 1425.2 °F)
N
Potassium
Electron Configuration
K = 1s22s22p63s23p6
4s1
Link
19
K
Potassium
What is Potassium?
Soft silvery metallic element belonging to group
1 of the periodic table (alkali metals). Occurs
naturally in seawater and a many minerals.
Highly reactive, chemically, it resembles sodium
in its behavior and compounds. Discovered by
Sir Humphry Davy in 1807.
57. Name: Calcium
Symbol: Ca
Atomic Number: 20
Atomic Mass: 40.078 amu
Melting Point: 839.0 °C (1112.15 °K, 1542.2 °F)
Boiling Point: 1484.0 °C (1757.15 °K, 2703.2 °F)
N
Calcium
Electron Configuration
Ca = 1s22s22p63s23p6
4s2
20
Ca
Calcium
What is Calcium?
Soft grey metallic element belonging to group 2
of the periodic table. Used a reducing agent in
the extraction of thorium, zirconium and
uranium. Essential element for living organisms.
58. 21
Sc
Scandium
Name: Scandium
Symbol: Sc
Atomic Number: 21
Atomic Mass: 44.95591 amu
Melting Point: 1539.0 °C (1812.15 °K, 2802.2 °F)
Boiling Point: 2832.0 °C (3105.15 °K, 5129.6 °F)
N
Scandium
Electron Configuration
Sc = 1s22s22p63s23p6
4s23d1
What is Scandium?
Rare soft silvery metallic element belonging to
group 3 of the periodic table. There are ten
isotopes, nine of which are radioactive and have
short half-lives. Predicted in 1869 by Mendeleev,
isolated by Nilson in 1879.
59. Name: Titanium
Symbol: Ti
Atomic Number: 22
Atomic Mass: 47.867 amu
Melting Point: 1660.0 °C (1933.15 °K, 3020.0 °F)
Boiling Point: 3287.0 °C (3560.15 °K, 5948.6 °F)
N
Titanium
Electron Configuration
Ti = 1s22s22p63s23p6
4s23d2
22
Ti
Titanium
What is Titanium?
White metallic transition element. Occurs in
numerous minerals. Used in strong, light
corrosion-resistant alloys. Forms a passive
oxide coating when exposed to air. First
discovered by Gregor in 1789.
60. Name: Vanadium
Symbol: V
Atomic Number: 23
Atomic Mass: 50.9415 amu
Melting Point: 1890.0 °C (2163.15 °K, 3434.0 °F)
Boiling Point: 3380.0 °C (3653.15 °K, 6116.0 °F)
N
Vanadium
Electron Configuration
V = 1s22s22p63s23p6
4s23d3
23
V
Vanadium
What is Vanadium?
Soft and ductile, bright white metal. Good resistance to corrosion by alkalis, sulphuric and
hydrochloric acid. It oxidizes readily about 933K. There are two naturally occurring isotopes of
vanadium, and 5 radioisotopes, V-49 having the longest half-life at 337 days. Vanadium has
nuclear applications, the foil is used in cladding titanium to steel, and vanadium-gallium tape is
used to produce a superconductive magnet. Originally discovered by Andres Manuel del Rio of
Mexico City in 1801. His discovery went unheeded, however, and in 1820, Nils Gabriel
Sefstron of Sweden rediscovered it. Metallic vanadium was isolated by Henry Enfield Roscoe
in 1867. The name vanadium comes from Vanadis, a goddess of Scandinavian mythology.
Silvery-white metallic transition element. Vanadium is essential to ascidians. Rats and chickens
are also known to require it. Metal powder is a fire hazard, and vanadium compounds should
be considered highly toxic. May cause lung cancer if inhaled.
61. Name: Chromium
Symbol: Cr
Atomic Number: 24
Atomic Mass: 51.9961 amu
Melting Point: 1857.0 °C (2130.15 °K, 3374.6 °F)
Boiling Point: 2672.0 °C (2945.15 °K, 4841.6 °F)
Electron Configuration
Cr = 1s22s22p63s23p6
4s13d5
N
24
Cr
Chromium
Link
What is Chromium?
Hard silvery transition element. Used in decorative
electroplating. Discovered in 1797 by Vauquelin.
Chromium
62. Name: Manganese
Symbol: Mn
Atomic Number: 25
Atomic Mass: 54.93805 amu
Melting Point: 1245.0 °C (1518.15 °K, 2273.0 °F)
Boiling Point: 1962.0 °C (2235.15 °K, 3563.6 °F)
Electron Configuration
Mn = 1s22s22p63s23p6
4s23d5
N
25
MnManganese
What is Manganese?
Grey brittle metallic transition element. Rather
electropositive, combines with some non-metals when
heated. Discovered in 1774 by Scheele.
Manganese
63. Name: Iron
Symbol: Fe
Atomic Number: 26
Atomic Mass: 55.845 amu
Melting Point: 1535.0 °C (1808.15 °K, 2795.0 °F)
Boiling Point: 2750.0 °C (3023.15 °K, 4982.0 °F)
Electron Configuration
Fe = 1s22s22p63s23p6
4s23d6
N
26
Fe
Iron
What is Iron?
Silvery malleable and ductile metallic transition
element. Has nine isotopes and is the fourth most
abundant element in the earth's crust. Required by
living organisms as a trace element (used in
hemoglobin in humans.) Quite reactive, oxidizes in
moist air, displaces hydrogen from dilute acids and
combines with nonmetallic elements.
Iron
64. Name: Cobalt
Symbol: Co
Atomic Number: 27
Atomic Mass: 58.9332 amu
Melting Point: 1495.0 °C (1768.15 °K, 2723.0 °F)
Boiling Point: 2870.0 °C (3143.15 °K, 5198.0 °F)
Electron Configuration
Co = 1s22s22p63s23p6
4s23d7
N
27
Co
Cobalt
What is Cobalt?
Light grey transition element. Some meteorites contain
small amounts of metallic cobalt. Generally alloyed for use.
Mammals require small amounts of cobalt salts. Cobalt-60,
an artificially produced radioactive isotope of Cobalt is an
important radioactive tracer and cancer-treatment agent.
Discovered by G. Brandt in 1737.
Cobalt
65. Name: Nickel
Symbol: Ni
Atomic Number: 28
Atomic Mass: 58.6934 amu
Melting Point: 1453.0 °C (1726.15 °K, 2647.4 °F)
Boiling Point: 2732.0 °C (3005.15 °K, 4949.6 °F)
Electron Configuration
Ni = 1s22s22p63s23p6
4s23d8
N
28
Ni
Nickel
Link
What is Nickel?
Malleable ductile silvery metallic transition element.
Discovered by A.F. Cronstedt in 1751.
Nickel
66. Name: Copper
Symbol: Cu
Atomic Number: 29
Atomic Mass: 63.546 amu
Melting Point: 1083.0 °C (1356.15 °K, 1981.4 °F)
Boiling Point: 2567.0 °C (2840.15 °K, 4652.6 °F)
Electron Configuration
Cu = 1s22s22p63s23p6
4s13d10
N
29
Cu
Copper
Link
What is Copper?
Red-brown transition element. Known by the Romans
as 'cuprum.' Extracted and used for thousands of years.
Malleable, ductile and an excellent conductor of heat
and electricity. When in moist conditions, a greenish
layer forms on the outside.
Copper
67. Name: Zinc
Symbol: Zn
Atomic Number: 30
Atomic Mass: 65.39 amu
Melting Point: 419.58 °C (692.73 °K, 787.24396 °F)
Boiling Point: 907.0 °C (1180.15 °K, 1664.6 °F)
Electron Configuration
Zn = 1s22s22p63s23p6
4s23d10
N
30
Zn
Zinc
What is Zinc?
Blue-white metallic element. Occurs in multiple
compounds naturally. Five stable isotopes are six
radioactive isotopes have been found. Chemically a
reactive metal, combines with oxygen and other non-
metals, reacts with dilute acids to release hydrogen.
Zinc
68. Foobar, wikipedia.org
Name: Gallium
Symbol: Ga
Atomic Number: 31
Atomic Mass: 69.723 amu
Melting Point: 29.78 °C (302.93 °K, 85.604004 °F)
Boiling Point: 2403.0 °C (2676.15 °K, 4357.4 °F)
N
Electron Configuration
Ga = 1s22s22p63s23p6
4s23d104p1
31
Ga
Gallium
What is Gallium?
Soft silvery metallic element, belongs to group 13 of the periodic
table. The two stable isotopes are Ga-69 and Ga-71. Eight
radioactive isotopes are known, all having short half-lives.
Gallium Arsenide is used as a semiconductor. Corrodes most
other metals by diffusing into their lattice. First identified by
Francois Lecoq de Boisbaudran in 1875.
Gallium
69. Name: Germanium
Symbol: Ge
Atomic Number: 32
Atomic Mass: 72.61 amu
Melting Point: 937.4 °C (1210.55 °K, 1719.3201 °F)
Boiling Point: 2830.0 °C (3103.15 °K, 5126.0 °F)
N
Electron Configuration
Ge = 1s22s22p63s23p6
4s23d104p2
32
GeGermanium
What is Germanium?
Lustrous hard metalloid element, belongs to group 14
of the periodic table. Forms a large number of
organometallic compounds. Predicted by Mendeleev
in 1871, it was actually found in 1886 by Winkler.
Germanium
70. Name: Arsenic
Symbol: As
Atomic Number: 33
Atomic Mass: 74.9216 amu
Melting Point: 817.0 °C (1090.15 °K, 1502.6 °F)
Boiling Point: 613.0 °C (886.15 °K, 1135.4 °F)
Electron Configuration
As = 1s22s22p63s23p6
4s23d104p3
N
33
As
Arsenic
What is Arsenic?
Metalloid element of group 15. There are three
allotropes, yellow, black, and grey. Reacts with
halogens, concentrated oxidizing acids and hot
alkalis. Albertus Magnus is believed to have been
the first to isolate the element in 1250.
Arsenic
71. Name: Selenium
Symbol: Se
Atomic Number: 34
Atomic Mass: 78.96 amu
Melting Point: 217.0 °C (490.15 °K, 422.6 °F)
Boiling Point: 684.9 °C (958.05005 °K, 1264.8201 °F)
Electron Configuration
Se = 1s22s22p63s23p6
4s23d104p4
N
34
Se
Selenium
What is Selenium?
Metalloid element, belongs to group 16 of the
periodic table. Multiple allotropic forms exist.
Chemically resembles sulfur. Discovered in
1817 by Jons J. Berzelius.
Selenium
72. Name: Bromine
Symbol: Br
Atomic Number: 35
Atomic Mass: 79.904 amu
Melting Point: -7.2 °C (265.95 °K, 19.04 °F)
Boiling Point: 58.78 °C (331.93 °K, 137.804 °F)
Electron Configuration
Br = 1s22s22p63s23p6
4s23d104p5
N
35
Br
Bromine
What is Bromine?
Halogen element. Red volatile liquid at room
temperature. Its reactivity is somewhere between
chlorine and iodine. Harmful to human tissue in a
liquid state, the vapor irritates eyes and throat.
Discovered in 1826 by Antoine Balard.
Bromine
RTC, wikipedia.org
73. Name: Krypton
Symbol: Kr
Atomic Number: 36
Atomic Mass: 83.8 amu
Melting Point: -157.2 °C (115.950005 °K, -250.95999 °F)
Boiling Point: -153.4 °C (119.75001 °K, -244.12 °F)
Electron Configuration
Kr = 1s22s22p63s23p6
4s23d104p6
N
36
Kr
Krypton
What is Krypton?
Colorless gaseous element, belongs to the noble gases.
Occurs in the air, 0.0001% by volume. It can be extracted from
liquid air by fractional distillation. Generally not isolated, but
used with other inert gases in fluorescent lamps. Five natural
isotopes, and five radioactive isotopes. Kr-85, the most stable
radioactive isotope, has a half-life of 10.76 years and is
produced in fission reactors. Practically inert, though known to
form compounds with fluorine.
Krypton
74. Name: Rubidium
Symbol: Rb
Atomic Number: 37
Atomic Mass: 85.4678 amu
Melting Point: 38.89 °C (312.04 °K, 102.002 °F)
Boiling Point: 688.0 °C (961.15 °K, 1270.4 °F)
N
37
Rb
Rubidium
What is Rubidium?
Soft silvery metallic element, belongs to group 1 of the
periodic table. Rb-97, the naturally occurring isotope, is
radioactive. It is highly reactive, with properties similar
to other elements in group 1, like igniting spontaneously
in air. Discovered spectroscopically in 1861 by W.
Bunsen and G.R. Kirchoff.
Rb = [Kr]5s1
Rubidium
75. Name: Strontium
Symbol: Sr
Atomic Number: 38
Atomic Mass: 87.62 amu
Melting Point: 769.0 °C (1042.15 °K, 1416.2 °F)
Boiling Point: 1384.0 °C (1657.15 °K, 2523.2 °F)
N
38
Sr
Strontium
What is Strontium?
Soft yellowish metallic element, belongs to group 2 of
the periodic table. Highly reactive chemically. Sr-90 is
present in radioactive fallout and has a half-life of 28
years. Discovered in 1798 by Klaproth and Hope,
isolated in 1808 by Humphry Davy. Sr = [Kr]5s2
Strontium
76. Name: Yttrium
Symbol: Y
Atomic Number: 39
Atomic Mass: 88.90585 amu
Melting Point: 1523.0 °C (1796.15 °K, 2773.4 °F)
Boiling Point: 3337.0 °C (3610.15 °K, 6038.6 °F)
N
39
Y
Yttrium
What is Yttrium?
Silvery-grey metallic element of group 3 on the periodic
table. Found in uranium ores. The only natural isotope
is Y-89, there are 14 other artificial isotopes. Chemically
resembles the lanthanoids. Stable in the air below 400
degrees, Celsius. Discovered in 1828 by Friedrich
Wohler.
Y = [Kr]5s24d1
Yttrium
77. Name: Zirconium
Symbol: Zr
Atomic Number: 40
Atomic Mass: 91.224 amu
Melting Point: 1852.0 °C (2125.15 °K, 3365.6 °F)
Boiling Point: 4377.0 °C (4650.15 °K, 7910.6 °F)
N
40
Zr
Zirconium
What is Zirconium?
Grey-white metallic transition element. Five natural
isotopes and six radioactive isotopes are known. Used
in nuclear reactors for a neutron absorber. Discovered
in 1789 by Martin Klaproth, isolated in 1824 by
Berzelius.
Zr = [Kr]5s24d2
Zirconium
78. Name: Niobium
Symbol: Nb
Atomic Number: 41
Atomic Mass: 92.90638 amu
Melting Point: 2468.0 °C (2741.15 °K, 4474.4 °F)
Boiling Point: 4927.0 °C (5200.15 °K, 8900.6 °F)
N
41
Nb
Niobium
What is Niobium?
Soft, ductile grey-blue metallic transition element. Used in
special steels and in welded joints to increase strength.
Combines with halogens and oxidizes in air at 200 degrees
Celsius. Discovered by Charles Hatchett in 1801 and
isolated by Blomstrand in 1864. Called columbium originally. Nb = [Kr]5s14d5
Niobium
79. Name: Molybdenum
Symbol: Mo
Atomic Number: 42
Atomic Mass: 95.94 amu
Melting Point: 2617.0 °C (2890.15 °K, 4742.6 °F)
Boiling Point: 4612.0 °C (4885.15 °K, 8333.6 °F)
N
42
MoMolybdenum
What is Molybdenum?
Silvery-white, hard metallic transition element. It is chemically
unreactive and is not affected by most acids. It oxidizes at high
temperatures. There are seven natural isotopes, and four radioisotopes,
Mo-93 being the most stable with a half-life of 3500 years. Molybdenum
is used in almost all high-strength steels, it has nuclear applications,
and is a catalyst in petroleum refining. Discovered in 1778 by Carl
Welhelm Scheele of Sweden. Impure metal was prepared in 1782 by
Peter Jacob Hjelm.
Mo = [Kr]5s14d5
Molybdenum
80. Name: Technetium
Symbol: Tc
Atomic Number: 43
Atomic Mass: (98.0) amu
Melting Point: 2200.0 °C (2473.15 °K, 3992.0 °F)
Boiling Point: 4877.0 °C (5150.15 °K, 8810.6 °F)
N
43
TcTechnetium
What is Technetium?
Radioactive metallic transition element. Can be detected in some stars and
the fission products of uranium. First made by Perrier and Segre by
bombarding molybdenum with deutrons, giving them Tc-97. Tc-99 is the most
stable isotope with a half-life of 2.6x106 years. Sixteen isotopes are known.
Organic technetium compounds are used in bone imaging. Chemical
properties are intermediate between rhenium and manganese. Tc = [Kr]5s24d5
Technetium
81. Name: Ruthenium
Symbol: Ru
Atomic Number: 44
Atomic Mass: 101.07 amu
Melting Point: 2250.0 °C (2523.15 °K, 4082.0 °F)
Boiling Point: 3900.0 °C (4173.15 °K, 7052.0 °F)
N
44
Ru
Ruthenium
What is Ruthenium?
Hard white metallic transition element. Found with
platinum, used as a catalyst in some platinum alloys.
Dissolves in fused alkalis, and is not attacked by acids.
Reacts with halogens and oxygen at high temperatures.
Isolated in 1844 by K.K. Klaus. Ru = [Kr]5s14d7
Ruthenium
82. Name: Rhodium
Symbol: Rh
Atomic Number: 45
Atomic Mass: 102.9055 amu
Melting Point: 1966.0 °C (2239.15 °K, 3570.8 °F)
Boiling Point: 3727.0 °C (4000.15 °K, 6740.6 °F)
N
45
Rh
Rhodium
What is Rhodium?
Silvery white metallic transition element. Found with
platinum and used in some platinum alloys. Not
attacked by acids, dissolves only in aqua regia.
Discovered in 1803 by W.H. Wollaston. Rh = [Kr]5s14d8
Rhodium
83. Name: Palladium
Symbol: Pd
Atomic Number: 46
Atomic Mass: 106.42 amu
Melting Point: 1552.0 °C (1825.15 °K, 2825.6 °F)
Boiling Point: 2927.0 °C (3200.15 °K, 5300.6 °F)
N
46
Pd
Palladium
What is Palladium?
Soft white ductile transition element. Found with some
copper and nickel ores. Does not react with oxygen at
normal temperatures. Dissolves slowly in hydrochloric
acid. Discovered in 1803 by W.H. Wollaston. Pd = [Kr]4d10
Palladium
84. Name: Silver
Symbol: Ag
Atomic Number: 47
Atomic Mass: 107.8682 amu
Melting Point: 961.93 °C (1235.08 °K, 1763.474 °F)
Boiling Point: 2212.0 °C (2485.15 °K, 4013.6 °F)
N
47
Ag
Silver
What is Silver?
White lustrous soft metallic transition element.
Found in both its elemental form and in minerals.
Used in jewelry, tableware and so on. Less
reactive than silver, chemically. Ag = [Kr]5s14d10
Silver
85. Name: Cadmium
Symbol: Cd
Atomic Number: 48
Atomic Mass: 112.411 amu
Melting Point: 320.9 °C (594.05 °K, 609.62 °F)
Boiling Point: 765.0 °C (1038.15 °K, 1409.0 °F)
N
48
Cd
Cadmium
What is Cadmium?
Soft bluish metal belonging to group 12 of the periodic
table. Extremely toxic even in low concentrations.
Chemically similar to zinc, but lends itself to more
complex compounds. Discovered in 1817 by F.
Stromeyer.
Cd = [Kr]5s24d10
Cadmium
86. Name: Indium
Symbol: In
Atomic Number: 49
Atomic Mass: 114.818 amu
Melting Point: 156.61 °C (429.76 °K, 313.898 °F)
Boiling Point: 2000.0 °C (2273.15 °K, 3632.0 °F)
N
49
In
Indium
What is Indium?
Soft silvery element belonging to group 13 of the
periodic table. The most common natural isotope is
In-115, which has a half-life of 6x104 years. Five
other radioisotopes exist. Discovered in 1863 by
Reich and Richter.
In = [Kr]5s24d105p1
Indium
87. Name: Tin
Symbol: Sn
Atomic Number: 50
Atomic Mass: 118.71 amu
Melting Point: 231.9 °C (505.05 °K, 449.41998 °F)
Boiling Point: 2270.0 °C (2543.15 °K, 4118.0 °F)
N
50
Sn
Tin
What is Tin?
Silvery malleable metallic element belonging to
group 14 of the periodic table. Twenty-six isotopes
are known, five of which are radioactive. Chemically
reactive. Combines directly with chlorine and oxygen
and displaces hydrogen from dilute acids. Sn = [Kr]5s24d105p2
Tin
88. Name: Antimony
Symbol: Sb
Atomic Number: 51
Atomic Mass: 121.76 amu
Melting Point: 630.0 °C (903.15 °K, 1166.0 °F)
Boiling Point: 1750.0 °C (2023.15 °K, 3182.0 °F)
N
51
Sb
Antimony
What is Antimony?
Element of group 15. Multiple allotropic forms. The
stable form of antimony is a blue-white metal. Yellow
and black antimony are unstable non-metals. Used
in flame-proofing, paints, ceramics, enamels, and
rubber. Attacked by oxidizing acids and halogens.
First reported by Tholden in 1450.
Sb = [Kr]5s24d105p3
Antimony
89. Name: Tellurium
Symbol: Te
Atomic Number: 52
Atomic Mass: 127.6 amu
Melting Point: 449.5 °C (722.65 °K, 841.1 °F)
Boiling Point: 989.8 °C (1262.95 °K, 1813.64 °F)
N
52
Te
Tellurium
What is Tellurium?
Silvery metalloid element of group 16. Eight
natural isotopes, nine radioactive isotopes. Used
in semiconductors and to a degree in some
steels. Chemistry is similar to sulfur. Discovered
in 1782 by Franz Miller.
Te = [Kr]5s24d105p4
Tellurium
90. Name: Iodine
Symbol: I
Atomic Number: 53
Atomic Mass: 126.90447 amu
Melting Point: 113.5 °C (386.65 °K, 236.3 °F)
Boiling Point: 184.0 °C (457.15 °K, 363.2 °F)
N
53
I
Iodine
What is Iodine?
Dark violet nonmetallic element, belongs to group 17 of
the periodic table. Insoluble in water. Required as a
trace element for living organisms. One stable isotope,
I-127 exists, in addition to fourteen radioactive isotopes.
Chemically the least reactive of the halogens, and the
most electropositive metallic halogen. Discovered in
1812 by Courtois.
I = [Kr]5s24d105p5
Iodine
91. Name: Xenon
Symbol: Xe
Atomic Number: 54
Atomic Mass: 131.29 amu
Melting Point: -111.9 °C (161.25 °K, -169.42 °F)
Boiling Point: -108.1 °C (165.05 °K, -162.58 °F)
54
Xe
Xenon
What is Xenon?
Colorless, odorless gas belonging to group 18 on the
periodic table (the noble gases.) Nine natural isotopes and
seven radioactive isotopes are known. Xenon was part of
the first noble-gas compound synthesized. Several others
involving Xenon have been found since then. Xenon was
discovered by Ramsey and Travers in 1898.
Xe = [Kr]5s24d105p6
Xenon
pslawinski, wikipedia.org
92. Name: Cesium
Symbol: Cs
Atomic Number: 55
Atomic Mass: 132.90546 amu
Melting Point: 28.5 °C (301.65 °K, 83.3 °F)
Boiling Point: 678.4 °C (951.55005 °K, 1253.12 °F)
N
55
Cs
Cesium
What is Cesium?
Soft silvery-white metallic element belonging to group 1 of
the periodic table. One of the three metals which are liquid
at room temperature. Cs-133 is the natural, and only stable,
isotope. Fifteen other radioisotopes exist. Cesium reacts
explosively with cold water, and ice at temperatures above
15 K. Cesium hydroxide is the strongest base known.
Cs = [Xe]6s1
Cesium
93. Name: Barium
Symbol: Ba
Atomic Number: 56
Atomic Mass: 137.327 amu
Melting Point: 725.0 °C (998.15 °K, 1337.0 °F)
Boiling Point: 1140.0 °C (1413.15 °K, 2084.0 °F)
N
56
Ba
Barium
What is Barium?
Silvery-white reactive element, belonging to group 2 of
the periodic table. Soluble barium compounds are
extremely poisonous. Identified in 1774 by Karl Scheele
and extracted in 1808 by Humphry Davy. Ba = [Xe]6s2
Barium
94. 57
LaLanthanum
Name: Lanthanum
Symbol: La
Atomic Number: 57
Atomic Mass: 138.9055 amu
Melting Point: 920.0 °C (1193.15 °K, 1688.0 °F)
Boiling Point: 3469.0 °C (3742.15 °K, 6276.2 °F)
N
What is Lanthanum?
(From the Greek word lanthanein, to line hidden) Silvery metallic
element belonging to group 3 of the periodic table and oft
considered to be one of the lanthanoids. Found in some rare-earth
minerals. Twenty-five natural isotopes exist. La-139 which is stable,
and La-138 which has a half-life of 1010 to 1015 years. The other
twenty-three isotopes are radioactive. It resembles the lanthanoids
chemically. Lanthanum has a low to moderate level of toxicity, and
should be handled with care. Discovered in 1839 by C.G. Mosander.
La = [Xe]5d16s2
Lanthanum
95. Name: Cerium
Symbol: Ce
Atomic Number: 58
Atomic Mass: 140.116 amu
Melting Point: 795.0 °C (1068.15 °K, 1463.0 °F)
Boiling Point: 3257.0 °C (3530.15 °K, 5894.6 °F)
N
58
Ce
Cerium
What is Cerium?
Silvery metallic element, belongs to the lanthanoids.
Four natural isotopes exist, and fifteen radioactive
isotopes have been identified. Used in some rare-earth
alloys. The oxidized form is used in the glass industry.
Discovered by Martin .H. Klaproth in 1803.
Ce = [Xe] 6s24f15d1
Cerium
96. Name: Praseodymium
Symbol: Pr
Atomic Number: 59
Atomic Mass: 140.90765 amu
Melting Point: 935.0 °C (1208.15 °K, 1715.0 °F)
Boiling Point: 3127.0 °C (3400.15 °K, 5660.6 °F)
N
59
PrPraseodymium
What is Praseodymium?
Soft silvery metallic element, belongs to the lanthanoids.
Only natural isotope is Pr-141 which is not radioactive.
Fourteen radioactive isotopes have been artificially
produced. Used in rare-earth alloys. Discovered in 1885
by C.A. von Welsbach.
Pr = [Xe] 6s24f3
Praseodymium
97. Name: Neodymium
Symbol: Nd
Atomic Number: 60
Atomic Mass: 144.24 amu
Melting Point: 1010.0 °C (1283.15 °K, 1850.0 °F)
Boiling Point: 3127.0 °C (3400.15 °K, 5660.6 °F)
N
60
NdNeodymium
What is Neodymium?
Soft bright silvery metallic element, belongs to the lanthanoids. Seven
natural isotopes, Nd-144 being the only radioactive one with a half-life of
1010 to 1015 years. Six artificial radioisotopes have been produced. The
metal is used in glass works to color class a shade of violet-purple and
make it dichroic. One of the more reactive rare-earth metals, quickly
reacts with air. Used in some rare-earth alloys. Neodymium is used to
color the glass used in welder's glasses. Neodymium is also used in very
powerful, permanent magnets (Nd2Fe14B). Discovered by Carl F. Auer
von Welsbach in Austria in 1885 by separating didymium into its
elemental components praseodymium and neodymium.
Nd = [Xe] 6s24f4
Neodymium
98. Name: Promethium
Symbol: Pm
Atomic Number: 61
Atomic Mass: (145.0) amu
Melting Point: Unknown
Boiling Point: Unknown
N
61
PmPromethium
What is Promethium?
Soft silvery metallic element, belongs to the lanthanoids. Pm-
147, the only natural isotope, is radioactive and has a half-life of
252 years. Eighteen radioisotopes have been produced, but all
have very short half-lives. Found only in nuclear decay waste.
Pm-147 is of interest as a beta-decay source, however Pm-146
and Pm-148 have to be removed from it first, as they generate
gamma radiation. Discovered by J.A. Marinsky, L.E. Glendenin
and C.D. Coryell in 1947.
Pm = [Xe] 6s24f5
Promethium
99. Name: Samarium
Symbol: Sm
Atomic Number: 62
Atomic Mass: 150.36 amu
Melting Point: 1072.0 °C (1345.15 °K, 1961.6 °F)
Boiling Point: 1900.0 °C (2173.15 °K, 3452.0 °F)
N
62
Sm
Samarium
What is Samarium?
Soft silvery metallic element, belongs to the lanthanoids. Seven natural
isotopes, Sm-147 is the only radioisotope, and has a half-life of 2.5x1011
years. Used for making special alloys needed in the production of
nuclear reactors. Also used as a neutron absorber. Small quantities of
samarium oxide is used in special optical glasses. The largest use of the
element is its ferromagnetic alloy which produces permanent magnets
that are five times stronger than magnets produced by any other
material. Discovered by Francois Lecoq de Boisbaudran in 1879.
Sm = [Xe] 6s24f6
Samarium
100. Name: Europium
Symbol: Eu
Atomic Number: 63
Atomic Mass: 151.964 amu
Melting Point: 822.0 °C (1095.15 °K, 1511.6 °F)
Boiling Point: 1597.0 °C (1870.15 °K, 2906.6 °F)
N
63
Eu
Europium
What is Europium?
Soft silvery metallic element belonging to the
lanthanoids. Eu-151 and Eu-153 are the only two
stable isotopes, both of which are neutron absorbers.
Discovered in 1889 by Sir William Crookes.
Eu = [Xe] 6s24f7
Europium
101. Name: Gadolinium
Symbol: Gd
Atomic Number: 64
Atomic Mass: 157.25 amu
Melting Point: 1311.0 °C (1584.15 °K, 2391.8 °F)
Boiling Point: 3233.0 °C (3506.15 °K, 5851.4 °F)
N
64
GdGadolinium
What is Gadolinium?
Soft silvery metallic element belonging to the
lanthanoids. Seven natural, stable isotopes are known
in addition to eleven artificial isotopes. Gd-155 and
Gd-157 and the best neutron absorbers of all
elements. Gadolinium compounds are used in
electronics. Discovered by J.C.G Marignac in 1880.
Gd = [Xe] 6s25d14f7
Gadolinium
102. Name: Terbium
Symbol: Tb
Atomic Number: 65
Atomic Mass: 158.92534 amu
Melting Point: 1360.0 °C (1633.15 °K, 2480.0 °F)
Boiling Point: 3041.0 °C (3314.15 °K, 5505.8 °F)
N
65
Tb
Terbium
What is Terbium?
Silvery metallic element belonging to the lanthanoids.
Tb-159 is the only stable isotope, there are seventeen
artificial isotopes. Discovered by G.G. Mosander in
1843. Tb = [Xe] 6s24f9
Terbium
103. Name: Dysprosium
Symbol: Dy
Atomic Number: 66
Atomic Mass: 162.5 amu
Melting Point: 1412.0 °C (1685.15 °K, 2573.6 °F)
Boiling Point: 2562.0 °C (2835.15 °K, 4643.6 °F)
66
DyDysprosium
What is Dysprosium?
Metallic with a bright silvery-white luster. Dysprosium belongs to the
lanthanoids. It is relatively stable in air at room temperatures, it will
however dissolve in mineral acids, evolving hydrogen. It is found in from
rare-earth minerals. There are seven natural isotopes of dysprosium,
and eight radioisotopes, Dy-154 being the most stable with a half-life of
3x106 years. Dysprosium is used as a neutron absorber in nuclear
fission reactions, and in compact disks. It was discovered by Paul Emile
Lecoq de Boisbaudran in 1886 in France. Its name comes from the
Greek word dysprositos, which means hard to obtain.
Dy = [Xe] 6s24f10
N
Dysprosium
104. Name: Holmium
Symbol: Ho
Atomic Number: 67
Atomic Mass: 164.93031 amu
Melting Point: 1470.0 °C (1743.15 °K, 2678.0 °F)
Boiling Point: 2720.0 °C (2993.15 °K, 4928.0 °F)
N
67
Ho
Holmium
What is Holmium?
Relatively soft and malleable silvery-white metallic element, which is stable in dry air at room temperature. It
oxidizes in moist air and at high temperatures. It belongs to the lanthanoids. A rare-earth metal, it is found in
the minerals monazite and gadolinite. It possesses unusual magnetic properties. One natural isotope, Ho-
165 exists, six radioisotopes exist, the most stable being Ho-163 with a half-life of 4570 years. Holmium is
used in some metal alloys, it is also said to stimulate the metabolism. Discovered by Per Theodor Cleve and
J.L. Soret in Switzerland in 1879. The name homium comes from the Greek word Holmia which means
Sweden. While all holmium compounds should be considered highly toxic, initial evidence seems to indicate
that they do not pose much danger. The metal's dust however, is a fire hazard.
Holmium
105. Name: Erbium
Symbol: Er
Atomic Number: 68
Atomic Mass: 167.26 amu
Melting Point: 1522.0 °C (1795.15 °K, 2771.6 °F)
Boiling Point: 2510.0 °C (2783.15 °K, 4550.0 °F)
68
Er
Erbium
What is Erbium?
Soft silvery metallic element which belongs to the lanthanoids.
Six natural isotopes that are stable. Twelve artificial isotopes
are known. Used in nuclear technology as a neutron absorber.
It is being investigated for other possible uses. Discovered by
Carl G. Mosander in 1843.
Erbium
106. Name: Thulium
Symbol: Tm
Atomic Number: 69
Atomic Mass: 168.9342 amu
Melting Point: 1545.0 °C (1818.15 °K, 2813.0 °F)
Boiling Point: 1727.0 °C (2000.15 °K, 3140.6 °F)
69
Tm
Thulium
What is Thulium?
Soft grey metallic element that belongs to the lanthanoids.
One natural isotope exists, Tm-169, and seventeen artificial
isotopes have been produced. No known uses for the
element. Discovered in 1879 by Per Theodor Cleve.
Thulium
107. Name: Ytterbium
Symbol: Yb
Atomic Number: 70
Atomic Mass: 173.04 amu
Melting Point: 824.0 °C (1097.15 °K, 1515.2 °F)
Boiling Point: 1466.0 °C (1739.15 °K, 2670.8 °F)
70
Yb
Ytterbium
What is Ytterbium?
Silvery metallic element of the lanthanoids. Seven
natural isotopes and ten artificial isotopes are known.
Used in certain steels. Discovered by J.D.G. Marignac
in 1878.
Ytterbium
108. Name: Lutetium
Symbol: Lu
Atomic Number: 71
Atomic Mass: 174.967 amu
Melting Point: 1656.0 °C (1929.15 °K, 3012.8 °F)
Boiling Point: 3315.0 °C (3588.15 °K, 5999.0 °F)
71
Lu
Lutetium
What is Lutetium?
Silvery-white rare-earth metal which is relatively stable in air. It happens to be the most expensive
rare-earth metal. Its found with almost all rare-earth metals, but is very difficult to separate from other
elements. Least abundant of all natural elements. Used in metal alloys, and as a catalyst in various
processes. There are two natural, stable isotopes, and seven radioisotopes, the most stable being
Lu-174 with a half-life of 3.3 years. The separation of lutetium from ytterbium was described by
Georges Urbain in 1907. It was discovered at approximately the same time by Carl Auer von
Welsbach. The name comes from the Greek word lutetia which means Paris.
Lutetium
109. Name: Hafnium
Symbol: Hf
Atomic Number: 72
Atomic Mass: 178.49 amu
Melting Point: 2150.0 °C (2423.15 °K, 3902.0 °F)
Boiling Point: 5400.0 °C (5673.15 °K, 9752.0 °F)
72
Hf
Hafnium
What is Hafnium?
Silvery lustrous metallic transition element. Used in
tungsten alloys in filaments and electrodes, also acts as
a neutron absorber. First reported by Urbain in 1911,
existence was finally established in 1923 by D. Coster,
G.C. de Hevesy in 1923.
Hafnium
110. Name: Tantalum
Symbol: Ta
Atomic Number: 73
Atomic Mass: 180.9479 amu
Melting Point: 2996.0 °C (3269.15 °K, 5424.8 °F)
Boiling Point: 5425.0 °C (5698.15 °K, 9797.0 °F)
73
Ta
Tantalum
What is Tantalum?
Heavy blue-grey metallic transition element. Ta-181 is a
stable isotope, and Ta-180 is a radioactive isotope, with
a half-life in excess of 10^7 years. Used in surgery as it
is unreactive. Forms a passive oxide layer in air.
Identified in 1802 by Ekeberg and isolated in 1820 by
Jons J. Berzelius.
Tantalum
111. Name: Tungsten
Symbol: W
Atomic Number: 74
Atomic Mass: 183.84 amu
Melting Point: 3410.0 °C (3683.15 °K, 6170.0 °F)
Boiling Point: 5660.0 °C (5933.15 °K, 10220.0 °F)
74
W
Tungsten
What is Tungsten?
White or grey metallic transition element, formerly
called wolfram. Forms a protective oxide in air and can
be oxidized at high temperature. First isolated by Jose
and Fausto de Elhuyer in 1783.
Tungsten
112. Name: Rhenium
Symbol: Re
Atomic Number: 75
Atomic Mass: 186.207 amu
Melting Point: 3180.0 °C (3453.15 °K, 5756.0 °F)
Boiling Point: 5627.0 °C (5900.15 °K, 10160.6 °F)
75
Re
Rhenium
What is Rhenium?
Silvery-white metallic transition element. Obtained as a
by-product of molybdenum refinement. Rhenium-
molybdenum alloys are superconducting.
Rhenium
113. Name: Osmium
Symbol: Os
Atomic Number: 76
Atomic Mass: 190.23 amu
Melting Point: 3045.0 °C (3318.15 °K, 5513.0 °F)
Boiling Point: 5027.0 °C (5300.15 °K, 9080.6 °F)
76
Os
Osmium
What is Osmium?
Hard blue-white metallic transition element. Found with
platinum and used in some alloys with platinum and
iridium.
Osmium
114. Name: Iridium
Symbol: Ir
Atomic Number: 77
Atomic Mass: 192.217 amu
Melting Point: 2410.0 °C (2683.15 °K, 4370.0 °F)
Boiling Point: 4527.0 °C (4800.15 °K, 8180.6 °F)
77
Ir
Iridium
What is Iridium?
Very hard and brittle, silvery metallic transition element. It has a yellowish cast to it. Salts of iridium are
highly colored. It is the most corrosion resistant metal known, not attacked by any acid, but is attacked by
molten salts. There are two natural isotopes of iridium, and 4 radioisotopes, the most stable being Ir-192
with a half-life of 73.83 days. Ir-192 decays into platinum, while the other radioisotopes decay into
osmium. Iridium is used in high temperature apparatus, electrical contacts, and as a hardening agent for
platinum. Discovered in 1803 by Smithson Tennant in England. The name comes from the Greek word iris,
which means rainbow. Iridium metal is generally non-toxic due to its relative unreactivity, but iridium
compounds should be considered highly toxic.
Iridium
115. Name: Platinum
Symbol: Pt
Atomic Number: 78
Atomic Mass: 195.078 amu
Melting Point: 1772.0 °C (2045.15 °K, 3221.6 °F)
Boiling Point: 3827.0 °C (4100.15 °K, 6920.6 °F)
78
Pt
Platinum
What is Platinum?
Attractive greyish-white metal. When pure, it is malleable and ductile. Does not oxidize in air, insoluble in hydrochloric and
nitric acid. Corroded by halogens, cyandies, sulphur and alkalis. Hydrogen and oxygen react explosively in the presence of
platinum. There are six stable isotopes and three radioisotopes, the most stable being Pt-193 with a half-life of 60 years.
Platinum is used in jewelry, laboratory equipment, electrical contacts, dentistry, and anti-pollution devices in cars. PtCl2(NH3)2
is used to treat some forms of cancer. Platinum-cobalt alloys have magnetic properties. It is also used in the definition of the
Standard Hydrogen Electrode. Discovered by Antonio de Ulloa in South America in 1735. The name comes from the Spanish
word platina which means silver. Platinum metal is generally not a health concern due to its unreactivity, however platinum
compounds should be considered highly toxic.
Platinum
116. Name: Gold
Symbol: Au
Atomic Number: 79
Atomic Mass: 196.96655 amu
Melting Point: 1064.43 °C (1337.5801 °K, 1947.9741 °F)
Boiling Point: 2807.0 °C (3080.15 °K, 5084.6 °F)
79
Au
Gold
What is Gold?
Gold is gold colored. It is the most malleable and ductile metal known. There is only one
stable isotope of gold, and five radioisotopes of gold, Au-195 being the most stable with a
half-life of 186 days. Gold is used as a monetary standard, in jewelry, dentistry,
electronics. Au-198 is used in treating cancer and some other medical conditions. Gold
has been known to exist as far back as 2600 BC. Gold comes from the Anglo-Saxon word
gold. Its symbol, Au, comes from the Latin word aurum, which means gold. Gold is not
particularly toxic, however it is known to cause damage to the liver and kidneys in some.
Gold
117. Name: Mercury
Symbol: Hg
Atomic Number: 80
Atomic Mass: 200.59 amu
Melting Point: -38.87 °C (234.28 °K, -37.966 °F)
Boiling Point: 356.58 °C (629.73 °K, 673.844 °F)
80
Hg
Mercury
What is Mercury?
Heavy silvery liquid metallic element, belongs to the
zinc group. Used in thermometers, barometers and
other scientific apparatus. Less reactive than zinc and
cadmium, does not displace hydrogen from acids.
Forms a number of complexes and organomercury
compounds.
Mercury
118. Name: Thallium
Symbol: Tl
Atomic Number: 81
Atomic Mass: 204.3833 amu
Melting Point: 303.5 °C (576.65 °K, 578.3 °F)
Boiling Point: 1457.0 °C (1730.15 °K, 2654.6 °F)
81
Tl
Thallium
What is Thallium?
Pure, unreacted thallium appears silvery-white and exhibits a metallic lustre. Upon reacting with air, it
begins to turn bluish-grey and looks like lead. It is very malleable, and can be cut with a knife. There
are two stable isotopes, and four radioisotopes, Tl-204 being the most stable with a half-life of 3.78
years. Thallium sulfate was used as a rodenticide. Thallium sulphine's conductivity changes with
exposure to infrared light, this gives it a use in infrared detectors. Discovered by Sir William Crookes
via spectroscopy. Its name comes from the Greek word thallos, which means green twig. Thallium and
its compounds are toxic and can cause cancer.
Thallium
119. Name: Lead
Symbol: Pb
Atomic Number: 82
Atomic Mass: 207.2 amu
Melting Point: 327.5 °C (600.65 °K, 621.5 °F)
Boiling Point: 1740.0 °C (2013.15 °K, 3164.0 °F)
82
Pb
Lead
What is Lead?
Heavy dull grey ductile metallic element, belongs to
group 14. Used in building construction, lead-place
accumulators, bullets and shot, and is part of solder,
pewter, bearing metals, type metals and fusible alloys.
Lead
120. Dschwen, wikipedia.org
Name: Bismuth
Symbol: Bi
Atomic Number: 83
Atomic Mass: 208.98038 amu
Melting Point: 271.3 °C (544.45 °K, 520.33997 °F)
Boiling Point: 1560.0 °C (1833.15 °K, 2840.0 °F)
83
Bi
Bismuth
What is Bismuth?
White crystalline metal with a pink tinge, belongs to group 15. Most
diamagnetic of all metals and has the lowest thermal conductivity of all
the elements except mercury. Lead-free bismuth compounds are used
in cosmetics and medical procedures. Burns in the air and produces a
blue flame. In 1753, C.G. Junine first demonstrated that it was different
from lead.
Bismuth
121. Name: Polonium
Symbol: Po
Atomic Number: 84
Atomic Mass: (209.0) amu
Melting Point: 254.0 °C (527.15 °K, 489.2 °F)
Boiling Point: 962.0 °C (1235.15 °K, 1763.6 °F)
84
Po
Polonium
What is Polonium?
Rare radioactive metallic element, belongs to group 16
of the periodic table. Over 30 known isotopes exist, the
most of all elements. Po-209 has a half-life of 103
years. Possible uses in heating spacecraft. Discovered
by Marie Curie in 1898 in a sample of pitchblende.
Polonium
122. Name: Astatine
Symbol: At
Atomic Number: 85
Atomic Mass: (210.0) amu
Melting Point: 302.0 °C (575.15 °K, 575.6 °F)
Boiling Point: 337.0 °C (610.15 °K, 638.6 °F)
85
At
Astatine
What is Astatine?
Radioactive halogen element. Occurs naturally from
uranium and thorium decay. At least 20 known isotopes.
At-210, the most stable, has a half-life of 8.3 hours.
Synthesized by nuclear bombardment in 1940 by D.R.
Corson, K.R. MacKenzie and E. Segre at the University
of California.
Astatine
123. 86
Rn
Radon
Name: Radon
Symbol: Rn
Atomic Number: 86
Atomic Mass: (222.0) amu
Melting Point: -71.0 °C (202.15 °K, -95.8 °F)
Boiling Point: -61.8 °C (211.35 °K, -79.24 °F)
Link
What is Radon?
Colorless radioactive gaseous element, belongs to the noble gases. Of the
twenty known isotopes, the most stable is Rn-222 with a half-life of 3.8
days. Formed by the radioactive decay of Radium-226. Radon itself decays
into polonium. Used in radiotherapy. As a noble gas, it is effectively inert,
though radon fluoride has been synthesized. First isolated in 1908 by
Ramsey and Gray.
Radon
124. Name: Francium
Symbol: Fr
Atomic Number: 87
Atomic Mass: (223.0) amu
Melting Point: 27.0 °C (300.15 °K, 80.6 °F)
Boiling Point: 677.0 °C (950.15 °K, 1250.6 °F)
87
Fr
Francium
What is Francium?
Radioactive element, belongs to group 1 of the periodic
table. Found in uranium and thorium ores. The 22
known isotopes are all radioactive, with the most stable
being Fr-223. Its existence was confirmed in 1939 by
Marguerite Perey.
Francium
125. Name: Radium
Symbol: Ra
Atomic Number: 88
Atomic Mass: (226.0) amu
Melting Point: 700.0 °C (973.15 °K, 1292.0 °F)
Boiling Point: 1737.0 °C (2010.15 °K, 3158.6 °F)
Link
88
Ra
Radium
What is Radium?
Radioactive metallic element, belongs to group 2 of the
periodic table. Most stable isotope, Ra-226 has a half-
life of 1602 years, which decays into radon. Isolated
from pitchblende in 1898 Marie and Pierre Curie.
Radium
126. 89
Ac
Actinium
Name: Actinium
Symbol: Ac
Atomic Number: 89
Atomic Mass: (227.0) amu
Melting Point: 1050.0 °C (1323.15 °K, 1922.0 °F)
Boiling Point: 3200.0 °C (3473.15 °K, 5792.0 °F)
What is Actinium?
Silvery radioactive metallic element, belongs to group 3 of the periodic
table. The most stable isotope, Ac-227, has a half-life of 217 years. Ac-
228 (half-life of 6.13 hours) also occurs in nature. There are 22 other
artificial isotopes, all radioactive and having very short half-lives.
Chemistry similar to lanthanum. Used as a source of alpha particles.
Discovered by A. Debierne in 1899.
Actinium
127. Name: Thorium
Symbol: Th
Atomic Number: 90
Atomic Mass: 232.0381 amu
Melting Point: 1750.0 °C (2023.15 °K, 3182.0 °F)
Boiling Point: 4790.0 °C (5063.15 °K, 8654.0 °F)
90
Th
Thorium
What is Thorium?
Grey radioactive metallic element. Belongs to actinoids.
Found in monazite sand in Brazil, India and the US.
Thorium-232 has a half-life of 1.39x10^10 years. Can
be used as a nuclear fuel for breeder reactors. Thorium-
232 captures slow neutrons and breeds uranium-233.
Discovered by Jons J. Berzelius in 1829.
Thorium
128. Name: Protactinium
Symbol: Pa
Atomic Number: 91
Atomic Mass: 231.03587 amu
Melting Point: 1600.0 °C (1873.15 °K, 2912.0 °F)
Boiling Point: Unknown
91
PaProtactinium
What is Protactinium?
Radioactive metallic element, belongs to the actinoids.
The most stable isotope, Pa-231 has a half-life of
2.43x104 years. At least 10 other radioactive isotopes
are known. No practical applications are known.
Discovered in 1917 by Lise Meitner and Otto Hahn.
Protactinium
129. Name: Uranium
Symbol: U
Atomic Number: 92
Atomic Mass: 238.0289 amu
Melting Point: 1132.0 °C (1405.15 °K, 2069.6 °F)
Boiling Point: 3818.0 °C (4091.15 °K, 6904.4 °F)
92
U
Uranium
What is Uranium?
White radioactive metallic element belonging to the
actinoids. Three natural isotopes, U-238, U-235 and U-234.
Uranium-235 is used as the fuel for nuclear reactors and
weapons. Discovered by Martin H. Klaproth in 1789.
Uranium
130. Name: Neptunium
Symbol: Np
Atomic Number: 93
Atomic Mass: (237.0) amu
Melting Point: 640.0 °C (913.15 °K, 1184.0 °F)
Boiling Point: 3902.0 °C (4175.15 °K, 7055.6 °F)
93
Np
Neptunium
What is Neptunium?
Radioactive metallic transuranic element, belongs to the actinoids. Np-237,
the most stable isotope, has a half-life of 2.2x106 years and is a by product
of nuclear reactors. The other known isotopes have mass numbers 229
through 236, and 238 through 241. Np-236 has a half-life of 5x103 years.
First produced by Edwin M. McMillan and P.H. Abelson in 1940.
Neptunium
131. Name: Plutonium
Symbol: Pu
Atomic Number: 94
Atomic Mass: (244.0) amu
Melting Point: 639.5 °C (912.65 °K, 1183.1 °F)
Boiling Point: 3235.0 °C (3508.15 °K, 5855.0 °F)
94
Pu
Plutonium
What is Plutonium?
Dense silvery radioactive metallic transuranic element, belongs to the actinoids. Pu-
244 is the most stable isotope with a half-life of 7.6x107 years. Thirteen isotopes are
known. Pu-239 is the most important, it undergoes nuclear fission with slow neutrons
and is hence important to nuclear weapons and reactors. Plutonium production is
monitored down to the gram to prevent military misuse. First produced by Gleen T.
Seaborg, Edwin M. McMillan, J.W. Kennedy and A.C. Wahl in 1940.
Plutonium
132. Lawrence Berkeley National Lab
Name: Americium
Symbol: Am
Atomic Number: 95
Atomic Mass: (243.0) amu
Melting Point: 994.0 °C (1267.15 °K, 1821.2 °F)
Boiling Point: 2607.0 °C (2880.15 °K, 4724.6 °F)
95
AmAmericium
What is Americium?
Radioactive metallic transuranic element, belongs to
the actinoids. Ten known isotopes. Am-243 is the most
stable isotope, with a half-life of 7.95x103 years.
Discovered by Glenn T. Seaborg and associates in
1945, it was obtained by bombarding uranium-238 with
alpha particles.
Americium
133. Name: Curium
Symbol: Cm
Atomic Number: 96
Atomic Mass: (247.0) amu
Melting Point: 1340.0 °C (1613.15 °K, 2444.0 °F)
Boiling Point: Unknown
Link
96
Cm
Curium
What is Curium?
Radioactive metallic transuranic element. Belongs to
actinoid series. Nine known isotopes, Cm-247 has a
half-life of 1.64x107 years. First identified by Glenn T.
Seaborg and associates in 1944, first produced by L.B.
Werner and I. Perlman in 1947 by bombarding
americium-241 with neutrons. Named for Marie Curie.
Curium
134. Name: Berkelium
Symbol: Bk
Atomic Number: 97
Atomic Mass: (247.0) amu
Melting Point: Unknown
Boiling Point: Unknown
97
Bk
Berkelium
What is Berkelium?
Radioactive metallic transuranic element. Belongs to
actinoid series. Eight known isotopes, the most
common Bk-247, has a half-life of 1.4x103 years. First
produced by Glenn T. Seaborg and associates in 1949
by bombarding americium-241 with alpha particles.
Berkelium
135. Name: Californium
Symbol: Cf
Atomic Number: 98
Atomic Mass: (251.0) amu
Melting Point: Unknown
Boiling Point: Unknown
98
CfCalifornium
What is Californium?
Radioactive metallic transuranic element. Belongs to actinoid series. Cf-
251 has a half life of about 700 years. Nine isotopes are known. Cf-252 is
an intense neutron source, which makes it an intense neutron source and
gives it a use in neutron activation analysis and a possible use as a
radiation source in medicine. First produced by Glenn T. Seaborg and
associates in 1950.
Californium
136. Name: Einsteinium
Symbol: Es
Atomic Number: 99
Atomic Mass: (252.0) amu
Melting Point: Unknown
Boiling Point: Unknown
99
EsEinsteinium
What is Einsteinium?
Appearance is unknown, however it is most probably metallic and silver or gray in color.
Radioactive metallic transuranic element belonging to the actinoids. Es-254 has the
longest half-life of the eleven known isotopes at 270 days. First identified by Albert
Ghiorso and associates in the debris of the 1952 hydrogen bomb explosion. In 1961 the
first microgram quantities of Es-232 were separated. While einsteinium never exists
naturally, if a sufficient amount was assembled, it would pose a radiation hazard.
Einsteinium
137. Name: Fermium
Symbol: Fm
Atomic Number: 100
Atomic Mass: (257.0) amu
Melting Point: Unknown
Boiling Point: Unknown
100
Fm
Fermium
What is Fermium?
Radioactive metallic transuranic element, belongs to
the actinoids. Ten known isotopes, most stable is Fm-
257 with a half-life of 10 days. First identified by Albert
Ghiorso and associates in the debris of the first
hydrogen-bomb explosion in 1952.
Fermium
138. Name: Mendelevium
Symbol: Md
Atomic Number: 101
Atomic Mass: (258.0) amu
Melting Point: Unknown
Boiling Point: Unknown
101
MdMendelevium
What is Mendelevium?
Radioactive metallic transuranic element. Belongs to the actinoid series. Only known
isotope, Md-256 has a half-life of 1.3 hours. First identified by Glenn T. Seaborg,
Albert Ghiorso and associates in 1955. Alternative name unnilunium has been
proposed. Named after the 'inventor' of the periodic table, Dmitri Mendeleev.
Mendelevium
139. Name: Nobelium
Symbol: No
Atomic Number: 102
Atomic Mass: (259.0) amu
Melting Point: Unknown
Boiling Point: Unknown
Link
102
No
Nobelium
What is Nobelium?
Radioactive metallic transuranic element, belongs to the actinoids. Seven known
isotopes exist, the most stable being No-254 with a half-life of 255 seconds. First
identified with certainty by Albert Ghiorso and Glenn T. Seaborg in 1966. Unnilbium
has been proposed as an alternative name.
Nobelium
140. Name: Lawrencium
Symbol: Lr
Atomic Number: 103
Atomic Mass: (262.0) amu
Melting Point: Unknown
Boiling Point: Unknown
103
LrLawrencium
What is Lawrencium?
Appearance unknown, however it is most likely silvery-white or grey and metallic. Lawrencium is a
synthetic rare-earth metal. There are eight known radioisotopes, the most stable being Lr-262 with
a half-life of 3.6 hours. Due to the short half-life of lawrencium, and its radioactivity, there are no
known uses for it. Identified by Albert Ghiorso in 1961 at Berkeley. It was produced by bombarding
californium with boron ions. The name is temporary IUPAC nomenclature, the origin of the name
comes from Ernest O. Lawrence, the inventor of the cyclotron. If sufficient amounts of lawrencium
were produced, it would pose a radiation hazard.
Lawrencium
141. Name: Rutherfordium
Symbol: Rf
Atomic Number: 104
Atomic Mass: (261.0) amu
Melting Point: Unknown
Boiling Point: Unknown
104
RfRutherfordium
What is Rutherfordium (Unnilquadium)?
Radioactive transactinide element. Expected to have similar chemical properties to
those displayed by hafnium. Rf-260 was discovered by the Joint Nuclear Research
Institute at Dubna (U.S.S.R.) in 1964. Researchers at Berkeley discovered Unq-257
and Unq-258 in 1964.
Rutherfordium
142. Name: Dubnium
Symbol: Db
Atomic Number: 105
Atomic Mass: (262.0) amu
Melting Point: Unknown
Boiling Point: Unknown
105
Db
Dubnium
What is Dubnium (Unnilpentium)?
Radioactive transactinide element. Half-life of 1.6s.
Discovered in 1970 by Berkeley researchers. So far,
seven isotopes have been discovered.
Dubnium
143. Name: Seaborgium
Symbol: Sg
Atomic Number: 106
Atomic Mass: (263.0) amu
Melting Point: Unknown
Boiling Point: Unknown
Link
106
SgSeaborgium
What is Seaborgium (Unnilhexium)?
Half-life of 0.9 +/- 0.2 s. Discovered by the Joint
Institute for Nuclear Research at Dubna (U.S.S.R.) in
June of 1974. Its existence was confirmed by the
Lawrence Berkeley Laboratory and Livermore National
Laboratory in September of 1974.
Seaborgium
144. Name: Bohrium
Symbol: Bh
Atomic Number: 107
Atomic Mass: (262.0) amu
Melting Point: Unknown
Boiling Point: Unknown
107
Bh
Bohrium
What is Bohrium (Unnilseptium)?
Radioactive transition metal. Half-life of approximately
1/500 s. Discovered by the Joint Institute for Nuclear
Research at Dubna (U.S.S.R.) in 1976. Confirmed by
West German physicists at the Heavy Ion Research
Laboratory at Darmstadt.
Bohrium
147. Einsteinium (Es)
Albert Einstein
– Relativity
– E = mc2
– Offered Presidency of Israel
– Element 99
– Photoelectric effect
• Solar calculator
148. Curium (Cm)
• Madame Curie
– Pioneer in radioactivity
• (Ra = radium)
– 25 pounds of pitchblende ore
yields 1/1000 of a gram of
radium
– Emits 2 millions times as much
radiation as uranium
• (Rn = radon gas)
– Discovered 5 elements
– Nobel Prize (5 in Curie family)
– Born in Poland
• (Po = polonium)
Marie Curie (1876–1934)
149. Radium (Ra)
Radium was used as a fluorescent paint on watch dials. It was
applied with thin brushes that workers would lick to keep a fine tip.
Many people died from the exposure to radium.
150. Radon Gas
Radon gas occurs naturally
from the radioactive decay
of radium. Radium is found
in small amounts in rock.
Ra Rn + radiation
Predicted fraction of homes over 4 picocuries/liter radon
151. Nobelium (No)
Element 102
Alfred Nobel
Nobel PrizeInventor:
dynamite (TNT)
blasting gelatin
“Merchant of Death”
CH3
NO2
NO2
O2N
Trinitrotoluene
152. Seaborgium (Sg)
Glenn Seaborg
– Separated f-block from rest of periodic table
– Worked on Manhattan Project
(Atomic bomb)
– Classified until after WW II
– Element 106
• Only living person to have an element named for
them
153. Silicon vs. Silicone
• Silicon (Si) element
• Silicone (…Si – O – Si…) polymer
– Sealant (caulk) prevents leaks
– Breast augmentation
No cause-and-effect relationship exists between
breast enlargement and breast cancer. Only one
researcher found a causal link.
154. Magnesium
Atomic Mass 24 amu
melting point =
silver gray metal
used in flash bulbs, bombs,and flares
8th most abundant element (2.2% of Earth’s crust)
lack of Mg produces same biological effect
as alcoholism (delirium tremens)
Mg
24.305
12
158. Periodic Table of the Elements
Images from:
http://www.chemsoc.org/viselements/pages/pertable_j.htm
Data from:
http://www.chemicalelements.com/
http://www.elementsdatabase.com/
Periodic Table of the Elements
Written by: Bill Byles - bylesb@internet4classrooms.com & Jeff Christopherson – unit5.org/chemistry
http://www.periodictable.com