History Of The Periodic Table Of Elements

History Of The Periodic Table Of Elements
Leonardo Miranda Mr. Tagami Chemistry 10/24/14 History of the Periodic Table of Elements The
construction of the Periodic Table of Elements was prior to the discovery of the individual elements.
Elements such as silver, gold, tin, copper, lead and mercury have been known for centuries. In 1649,
the first scientific discovery of an element was made by Hennig Brand when he discovered
phosphorous. Prior to Brand's discovery, chemists had acquired an immense body of understanding
concerning the properties of elements and their compounds for the next 200 years. By the year 1869,
a collection of 63 elements had been revealed. As the number of known elements increased,
scientists began to notice patterns in properties and formulate classification schemes. In 1862, a
French geologist, A.E.Beguyer de Chancourtois, recorded a list of the elements on a cylinder
regarding their individual atomic weights. He was the first to identify that elemental properties
reoccur every seven elements. There has been some deviation on who deserves credit for being the
"father" of the periodic table, either the German Lothar Meyer or the Russian Dmitri Mendeleev.
Both chemists shockingly produced similar results during the same time period working
individually. Meyer's 1864 textbook included a shortened version of the periodic table, which
contained about half of the known elements ordered by their atomic weight and valence charges. In
1868, Meyer assembled a prolonged version of the periodic
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Interpreting The Periodic Table Lab Report
Interpreting the Periodic Table Lab Report Name: Kelsey Cordero and Bruno Canteros Lab Partners:
Ashley Fernandez, Lab Experiment: Interpreting the Periodic Table Date: January 15, 2015
Introduction: The periodic table is the most important chemistry reference there is. It arranges all the
known elements in an informative array. Just like when entering a grocery store similar items are
grouped together which makes an item easier to find. Elements are arranged left to right and top to
bottom in order of increasing atomic number. The different rows of elements are called periods. The
period number of an element signifies the highest energy level an electron in that element occupies.
An element is a substance that is made ... Show more content on Helpwriting.net ...
Materials: (Activity 1) 1. Calcium 2. Sulfur 3. Aluminum 4. Silicon 5. Carbon 6. Paper 7. Copper 8.
Pencil 9. Iron 10. Magnesium (Activity 2) 1. Periodic Table Element Cards Procedure: The whole
procedure for Activity 1: 1. Provide yourself with a pencil and paper. 2. As the teacher assigns you
to a station, in that station are two elements where you must describe the physical features of the
element. 3. As you rotate from station to station make sure to observe each and every element
clearly until you have completed all 8 elements. 4. Once you are done use your notes to help you
organize the elements into groups. The Procedure Activity 2: 1. Designate a group member to
retrieve the periodic table cards. 2. Look for an open space to work with your group. 3. Use the
periodic table to arrange the elements in order. 4. Once ordered observe the properties in the cards
and try to find any and all patterns. Table 1. Activity 1. Element Description Calcium rough, light
gray, rocky texture, solid, malleable, dull Aluminum shiny, smooth, crunchy, gray, solid, malleable
Carbon rough, black, chalky, squeaky like styrofoam, light weighted, solid Copper shiny, light
orange/peach, smooth, solid, malleable Iron solid, shiny, gray, high pitch, smooth, malleable
Magnesium malleable, solid, soft, smooth Sulfur soft, powdery, yellow, dullish, solid Silicon shiny,
metal, rough, gray, solid Table 2. Activity 1.

My Table Conflict
The struggle between staying within society's expectations and the desire to make a commitment to
one's art can be daunting. This dilemma has been questioned for ages. Sometimes society even
questions someone who doesn't quite fit into a norm they believe exists. These conflict or struggle is
addressed in Jane Campion's film, An Angel at My Table. The film is based on a trilogy of
autobiographies by Australian author, Janet Frame. Adapted originally for a three part mini–series,
the film chronicles Janet's life from childhood to young adulthood. Throughout the film its director
highlights the contest for one person, with immense talent and insecurity, to conform to the social
norms of the 30's, 40's, and onward. The director's use of narrations, ... Show more content on
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Janet throughout the film is notably placed in windows. In Mark Cousins book The Story of Film he
mentions Campion's way of making Frame look startled in the film. "Campion and her
cinematographer, Stuart Dryburgh, used–wide angle lenses to exaggerate spaces in the film"
(Cousins, 708). Her mother frames her face in the first train station scene in order to protect her
from the scenes of mental illness out her window. "Framed by the window Janet is still contained"
(Gillet). She is looking outside for what awaits. Her containment within that window can also be
viewed as her containment in her mind as far as the community sees it. A positive outlook is asserted
in the scenes where Janet is in Spain. In this shots she is sitting in the window while it is wrapped
around her. She smiles, alone in her freedom to be who she without restrictions from outer
infringements. Finally, the closing scene, the author is home and content to be within that window.
Sue Gillet concurs; "She speaks the words she has found to write, comforting words " (Gillet, 1).
Janet Frame is no longer is is confined to was society wants from

Periodic Table
How The Elements of Periodic Table used in our daily life? Chemistry plays a great role in our daily
life. Everything in our lives from material to life involves chemistry. Life without chemical elements
cannot be imagined. They are the makeup of many things around us and play apart in many primary
functions. For instance, to do metabolism, almost 99% of our body weight contains the element,
65% oxygen, 18% carbon, 10% Hydrogen 3% nitrogen and so on. Elements make up DNA and
RNA which are the building blocks for genetic materials. Although, they are used for breathing and
are essentials components for nutrition. Besides this, elements are used to make nuclear weapons
and technologies such as computers, TVs, and mobile phones. Elements are very important for
living organisms. Living organisms have to metabolize in order to sustain life. Metabolism is a
chemical process that provides adequate energy for our body cells to function properly. In
metabolism, organic compounds are broken down to simpler molecules and provide ... Show more
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Animals exhale carbon dioxide and take oxygen while plants inhale carbon dioxide and flush out
oxygen. elements such as nitrogen, oxygen, carbon, and argon make up the air we breathe so we can
rely on to stay alive. However, a radioactive elements like Uranium with different isotopes are
heavily used to make nuclear bombs today. Furthermore, elements are vital for modern technologies
and contribute for many products. they combine one another to make up products. For example,
silicon to plastics and glasses, copper to make electrical wire and coins, aluminum to make parts of
air craft, sulfur to make matches and sulfuric acid for car batteries, chlorine to kill germs of drinking
water, iron to make steels and so on. Elements are also used for electronics, advanced transportation,
healthcare, military purpose and

Mendeleev 's The Periodic Table Of The Elements
Dmitri Mendeleev, who developed the periodic table of the elements, was one of sciences most
influential leaders. Before Mendeleev, religion and beliefs shaped people's choices rather than
science and facts. Mendeleev's fame and dedication changed that. Throughout his life, Mendeleev
was a leader in science and the legacy he left behind led others to discover new elements and
facilitate chemistry for generations to come. Dmitri Ivanovich Mendeleev was born on February 8th,
1834 in Tobolsk, Russia. Mendeleev was the seventeenth child out of seventeen born to Ivan
Mendeleev and Maria Kornilyeva. Three of the children died at birth. All fourteen of the children
who lived received Christian names. Mendeleev's father, Ivan Pavlovich Mendeleev, became blind
the same year Mendeleev was born, which left the family in a difficult position. While Mendeleev's
family was affluent and successful, they did not have excess wealth. After his father became blind
and unable to work, Mendeleev's mother took a job governing her brother's glass factory in hope
that the money would assist in raising her children. The outcome was dismal and eventually the
glass factory burnt down. At age seven, a year earlier than was normally allowed, Mendeleev started
his education at the gymnasium his father had taught at. Throughout his primary education,
Mendeleev was average in all classes except chemistry, where he earned much higher marks. He
graduated a year early from the gymnasium at age fifteen.

What Is A Coffee Table Essay
A coffee table, which is also known as a center table, is a low table , specially designed to be placed
in front of a sofa. Your coffee table should be such that looks good, serves well and displays a few
accessories that reveal your personality and goes well with living room decor. A coffee table is
usually the centre of attraction in a living room. It should not just be not a mere piece of furniture
but also be functional and hopefully likely to become a conversation piece among the guests
Things to consider
1. Requirements are the priority: The coffee table that you plan to buy should be as per your needs,
beforehand decide what will be the utility of purchasing a coffee table for your living room.
2. Don't forget to measure: The size of the coffee table will largely depend on the sofa size and the
sitting arrangements. The standard height for coffee tables is from 16 to 18 inches, but may go as
high as 21 inches. A higher table is a smart choice if you entertain frequently so that guests don't
have to bend too much to set down their drinks. But, ultimately, the height of the adjacent
upholstered pieces should determine the height of the table. One guideline is that a coffee table
should be about the same height or one or two inches lower than the seat height of the sofa. And
keep in mind to leave at least ... Show more content on Helpwriting.net ...
A coffee table is an ideal spot to display a grouping attractive conversation pieces. Though you may
keep it simple one stunning piece for impact or a few smaller curios of varying heights and textures
for visual interest are all that's needed. For adding a graceful look and a soothing fragrance in the
living room, you may place a small decorative bowl and add some scented floating candles with
rose petals. Apart from this, you may enhance the décor by placing a small flower pot in the center
of the coffee table with some fresh

Potassium: A Chemical Element On The Periodic Table
Potassium essay Potassium is a chemical element on the periodic table with the symbol K from
Neo–Latin, Kalium. Potassium comes from the alkali metals family on the periodic table and has
one valence electron. It has 20 neutrons,19 protons and the same amount of electrons . It has an
atomic number of 19 and an atomic mass of 39.0983. Its Melting point is 146.08 degrees and it's
boiling point is 1,398 degrees. In room temperature potassiums phase is solid. The second most
dense metal after lithium is potassium, It is a soft solid and can be easily cut with a knife. Potassium
begins to tarnish toward gray immediately on exposure to air. Potassium is a silvery gray color but
when mixed with water it explodes with a purple flame. Potassium is ... Show more content on
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Most people use potassium compounds to create things such as potassium soap. Potassium ions are
helpful for all living cells to function. Fresh fruits and vegetables are good dietary sources of
potassium. It cost about $100 for 100g of potassium. You can find potassium in food such as
bananas, avocados, cooked spinach, potatoes, oranges, apricots, and prunes. Potassium is necessary
for proper function in your body system and is one of the top electrolytes in your body. Potassium is
a role in regulating fluid levels in your body. The electrolyte works to balance in you blood cells,
manage your blood pressure, and keeps your heart functioning. Potassium also helps in your nervous
system by helping in the correct function of tissues for nerve impulses. But potassium also has some
bad effects as well. It can lead to bad physical and mental problems. Insomnia, anorexia, and
depression are some mental side effects. Poor reflex, kidney failure and heart attack are some of the
physical effects that potassium can do. There are some reasons to why you could activate these
potassium symptoms such as excessive alcohol, poor overall health, high stress, and long period of
vomiting. All of these things can make your potassium level drop quickly. The best way to keep a
stable potassium level is to eat fruit and

The Classification Of Elements Of The Periodic Table
The periodic table shows the classification of elements. It shows the elements' atomic numbers,
masses, and symbols for each element. Elements are placed into rows and columns. The rows are
called periods, and the columns are called groups. These help classify where the elements go on the
periodic table. For example, the elements in the very last group on the periodic table are known as
inert and noble gases. The modern periodic table resulted from trial, error, and succession. As more
elements were discovered, the periodic table had to go through many changes to fit these newly
discovered elements. This led to the modern periodic table we have today. Back in EBC, there was
little if any science that was known. Although Gold (Au), Silver (Ag), Tin (Sn), Copper (Cu), Lead
(Pb), and Mercury (Hg) are used on the modern periodic table, these elements were known by
people for thousands of years. Aristotle, a philosopher, thought that the world was not just created
out of nowhere. It has to be created by something. Aristotle thought that "roots" created the Earth.
Plato, another philosopher, agreed with Aristotle. However, Plato called the "roots" "elements"
instead. The term element was originally associated with what created the Earth: Air, Earth, Water,
and Fire. These "elements" were used to explain what made up the Earth. People agreed with this
idea for over a thousand years, until modern elements were discovered starting in the 1600s (WOU).
In 1649, there

History Of The Periodic Table
History of the Periodic Table Austin Smith LSG5 Scientists all around the world have attempted to
group, sort and organise elements together for hundreds of years, with initial classification systems
dating decades before the dawn of an actual table in the nineteenth century. An example of early
work prior to the 1800s is Antoine Lavoisier and partners Antoine Fourcroy, Louis–Bernard Guyton
de Morveau and Claude–Louis Berthollet's list of elements. While this one dimensional system
documented all of the 33 elements known at the time (and still shares the same idea of organising
the elements), sorting them based on a variety of physical factors proved to be much more complex
than imagined (Scerri, 2011). Dobereiner's Triads of Elements (Dobereiner's Law of Triads, no date)
In 1817, Johann Wolfgang Dobereiner was one of the first to create a milestone for future
classification systems. He attempted to structure the elements together based off of elements with
similar traits, grouping elements in groups of three, together forming what was called a 'triad'
(Western Oregon University, 1997). Dobereiner created his three–element structure when he noticed
that the atomic weight of strontium was almost the average of calcium and barium, all of which
shared similar properties (Dobereiner's Law of Triads, no date). Dobereiner noticed such pattens
more often, two triads being the halogen triad, consisting of chlorine, bromine, and iodine as well as
an alkali metal triad, consisting

Periodic Table Lab Report
First off, what is a periodic table? A periodic table is a table of chemical elements, which are
arranged according to their atomic number, as well as other similarities. When you look at a periodic
table for the first time, it can be overwhelming to see all of the elements. Once you take a closer
look, you notice that they are arranged in certain groups. As stated in the lab website, each of the
groups has a number (1–18) associated with it. Each of the elements all contains their names, the
number of elections they have, and their atomic mass. For example, a really commonly known
element is Hydrogen. Hydrogen contains one election and its atomic mass is 1.008. Now that you
know a little about what a periodic table is, I will go on to talk ... Show more content on
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For this experiment, it is important to only mix the regents and metals the lab website states. In
doing this, you will be able to accurately fill in the two tables with the observations you
encountered. In part one of the experiment, when Ba(NO3)2 reacted with H2SO4 it forms
H(NO3)+BaSO4 and forms a white precipitate, because the compound BaSO4 is insoluble. When
the reagents and group 2 nitrates did not have a reaction, this meant that they did not precipitate,
meaning the reaction was soluble. Some of the chemical equations where the reactions were soluble
were: Ca(NO3)2(aq)+H2SO4(aq)→H(NO3)(aq)+CaSO4(aq),
Mg(NO3)2(aq)+H2SO4(aq)→H(NO3)(aq)+MgSO4(aq),
Ca(NO3)2(aq)+KIO3(aq)→K(NO3)+Ca(IO3)2(aq), and
Sn(NO3)2(aq)+KIO3(aq)→K(NO3)+Sn(IO3)2(aq). Since the compounds were aqueous the
reactions were soluble. There were more chemical equations that where insoluble than soluble.
Some of the chemical equations for the soluble reactions were:
Ba(NO3)2(aq)+Na2CO3(aq)→Na(NO3)(aq)+BaCO3(s), Ca(NO3)2(aq)+Na2CO(aq)→Na(NO3)
(aq)+CaCO3(s), and Ba(NO3)2(aq)+(NH4)2C2O4(aq)→BaC2O4(s)+(NH4)(NO3)(s). In part two of
the experiment we were observing the reaction between regents and metals. Copper was the least
reactive with all of the reagents. There was no activity whatsoever with any of the reagents. Once
we conducted all of the reagents with the metals, we were able to organize

Advantages Of Eating Tables
28. The most effective method to Get Stylish Dining Tables
These days, there are distinctive plans of eating tables that you can look over. It is just regular to
need lounge area furniture that radiates polish and excellence. Since there are a great deal of a la
mode outlines to look over, it can be very difficult to settle for a solitary configuration. Somewhere
in the range of few purchasing tips ought to help you decide immediately when you go looking for
feasting tables.
While picking the right feasting table, it is essential to remember your own tastes and inclinations.
You ought to likewise consider the general configuration of your lounge area and whole house too.
This will help you discover the feasting tables plan that will mix in well with whatever remains of
your home stylistic theme. The plans arrive in an assortment of conventional and current styles. In
the event that you pick a conventional style of eating table, ensure that you search ... Show more
That likens to more conservative costs at any furniture store in Jefferson City, MO. Since eateries
work on a thin overall revenue, plastic furniture can be a great approach to spare cash. Contingent
on the sort of wood utilized, wood tables and seats can be significantly more costly, even at a rebate
furniture store in mid–Missouri.
Another advantage of plastic furniture is that it is by and large lighter in weight than wood. Eatery
staff will welcome that, particularly when it's a great opportunity to tidy up by the day's end. Tables
and seats must be moved around with a specific end goal to clean them or to clean under them.
Accordingly, before requesting things from a furniture store in mid–Missouri or somewhere else, an
eatery proprietor would be savvy to by and by look at those things to test their weight. Nobody
needs to manage back strain brought on by lifting or moving tables and seats that are too

Phosphorus On The Periodic Table
The way phosphorus was discovered I find to be interesting. Henning Brand a German in 1669 was
conducting an experiment using urine to turn into philosopher's stone that can turn certain metal into
gold ("The Element Phosphorus." It's Elemental –. Web. 23 Dec. 2015. ) He then isolated a white
material that glowed and little did he know that it was white phosphorus. Phosphorus is represented
by the letter P on the periodic table of elements. It in group 3 and its atomic mass is 15. It is part of
the pnictogen family. It general classification is non–metal. Phosphorus is a solid. There are two
types of Phosphorus red and white. White has a garlic like odor it's a soft waxy solid and can easily
cut with a knife.Can spontaneously ignite with ... Show more content on Helpwriting.net ...
It's not found in its pure form because white Phosphorus could spontaneously ignite with the air. It is
an essential element for the life of organisms. If you have rich soil it is more likely to have more
Phosphorus than regular soil but all soil has Phosphorus. It exist in nature in several allotropic
forms.Some example of the different form of allotropic are: Red, White, VIolet,and Black. The only
important commercial source of Phosphorus is phosphate rock. United States of America is one of
the largest producer of phosphate rock. It has to go through the Phosphorus cycle. The Phosphorus
cycle is similar to several other mineral nutrient cycles in that P exists in soils and minerals, living
organisms, and water ("Phosphorus." University of Maryland Medical Center. Web. 23 Dec.
2015.)The is a good supply of Phosphorus on earth so we don't have to worry about running out (
State of the Planet Phosphorus Essential to Life Are We Running Out Comments. Web. 23 Dec.
2015.) It cost about 25 cents per gram of Phosphorus and it is a open market. I think it is a benefit to
society because it is essential for the creation of DNA, cell membranes, and for bone and teeth
formation in human. (State of the Planet Phosphorus Essential to Life Are We Running Out
Comments. Web. 23 Dec. 2015.) In the long run even though white Phosphorus can ignite
spontaneously it is going to have to be a

The Periodic Table Of Elements
Throughout history the periodic table of elements has been influenced and amended by multiple
scientists. These scientists include Johann Dobereiner, A.E Beguyer de Chancourtois, John
Newlands, and Glenn Seaborg. As well as Dmitri Ivanovich Mendeleev and Lothar Meyer the
creators of the periodic table. There are many ways that the periodic table of elements was set out.
For example the table can be organized using patterns between atomic numbers, electronegativity,
ionization energy, structure (gas or solid) valence electrons and electron configuration (shells) as
seen in the modern day periodic table. Before history was recorded humans had knowledge of
certain elements including gold (Au), copper (Cu), silver (Ag), mercury (Hg), tin (Sn) and lead (Pb).
Nevertheless, it wasn't until the year of 1669 that Hennig Brand discovered the very first element –
Phosphorous (P) – through scientific inquiry. Hennig Brand discovered phosphorous through
extracting it from urine. Due to the element having the ability to grow in the dark it was referred to
as "light bearer". In 1980 English chemist Robert Boyle discovered phosphorous independently,
following Hennig Brand keeping the process of his discovery secret. Additionally, Johann
Dobereiner began grouping elements with like properties into triads – groups of 3 elements –
between 1817 and 1829. His work began in 1817 after he noticed that the atomic weight of
Strontium (Sr) was medially between the atomic weights of calcium and

Elements: Arranging The Periodic Table
Arranging the Periodic Table The periodic table is arranged in different ways. The periodic table
organizes the elements in horizontal rows, or periods, by order of increasing the atomic number,
which equals the number of protons in the atomic nucleus of each element. Elements are arranged in
the periodic table in order of its increasing atomic number. The table allows chemists to make
accurate predictions of physical and chemical properties from any element. On the periodic table it
features: groups– vertical columns within the table which will contain elements with almost the
same chemical reactions & as well as physical properties which result from a common number of
electrons in the outer shell. It also displays periods, which are rows ... Show more content on
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There is a special name given to the horizontal rows on the periodic table. They are called periods.
The first row, the one containing hydrogen and helium, is called the first period. The second row is
called the second period. Groups The vertical columns on the periodic table are called groups or
families. All the elements have in a group have similar chemical properties. Each group is
represented by a roman numeral and a letter which is the abbreviation of the element. Some periodic
tables highlight which group is which group. In the picture that I have included above highlights
different groups on different colors. The groups or families are either metal, non–metals, gasses &
liquids. They are separated that way so it can be easy for a chemist or someone to identify what kind
of element it is. It is also easier so they can identify their chemical properties and their physical
properties. The periodic table being arranged is very good because it is very helpful and if it was not
arranged the way it was, many people would have a very difficult time trying to figure out which
element is which and what their atomic mass is. The periodic table alone is what helps us know what
element we are going to be dealing with and how much atomic mass the element

Periodic Table Research Paper : Madison
Periodic Table Research Paper Madison Swanson Manson Northwest Webster Abstract Today, the
periodic table is used by many people worldwide to learn more about the elements located on it. It
has evolved into a much easier piece of information to use because of all the many scientists and
chemists that have revised it over the last hundred ish years. There are certain things on the periodic
table that help to learn more about each element. Periodic families are used to help understand
similarities between the atomic structures of elements. Trends are used to show certain patterns
within the periodic table. One can learn many things about the periodic table from studying it.
History of the Periodic Table The periodic table is a scientific table with all of the known elements
found throughout history and is organized in order of increasing atomic numbers. The first discovery
of an element was in 1649 by a man named Hennig Brand and in the following two centuries,
chemists all over the world kept finding similar properties and decided to start categorizing them
into similar groups. In 1869, Dmitri Mendeleev (see figure 1) was the first man to come up with a
periodic table based on atomic mass. Since then many other scientists have provided more
information to make the periodic table what it is today. There are multiple periodic tables all
including the same elements but some containing more or less information on each element.
Information

Boron On The Periodic Table
"Boron" Boron is one of 118 elements on the Periodic Table and is in everyday life. Boron has a lot
of facts to learn about such as, "Who found or created this element?" or, "What uses do this element
have?". Out of all the elements, Boron is an interesting element that stands out from others because
it is a powder. This element is also a necessary ingredient that is used in soap. From all the elements
on the periodic table, Boron is a unique element in a lot of ways such as the fact that Boron is a
metalloid; metalloids are not very common in the periodic table. In this essay, Boron is in a number
of questions that will be answered. Boron is an unquestionably interesting element.
First of all, the name of this element is Boron. Its symbol is just, "B". Boron is in group 13 of the
periodic table which is called, "The Boron Group", since Boron is the first element of group 13. It is
also a Period 2 element. Boron is a solid. It also has 2 energy shells. Boron's atomic number is 5 and
its atomic mass is 10.811 atomic mass units. Also, it has 5 protons, 5 electrons, and 6 neutrons. It is
a powder, but the powder is still a solid. It has a color that you can see in iron fillings – sort of like
graphite from the lead in a pencil. The graphite of ... Show more content on Helpwriting.net ...
The first reason is that Boron is a unique element. I had heard about others and wanted to learn a
new element. I wanted to take advantage of this project and actually learn about something new –
which is this element. I had other choices too, but I wanted to learn about Boron. The second reason
is that Boron is a powder. There are not many elements on the Periodic Table that are a powder. So,
that makes Boron even more unique and also encourages me to learn more about Boron. My final
reason is that Boron has a lot of information. Compared to some other elements, Boron has more
information that can be used to learn or study. Most of that information is interesting

The Birth Of The Periodic Table
In September 1860 the birth of the Periodic table began. A group of the world 's best chemists
assembled in Germany to discuss the issues of atomic mass. At this meeting an Italian chemist,
Stanislao Cannizzaro, introduced the right way to accurately measure the relative mass of an atom.
After the new method was introduced chemists started to recognize similarities in the properties of
various elements and placed them into families. In this earlier stages of the periodic table there were
four main chemists; Dobereiner, Newlands, Lothar Meyer, and Dmitri Mendeleev that played a
substantial role in the development of the periodic table. Dobereiner started with a few family
groups each containing three elements. Newlands put the elements of those families in repeating
groups called octaves. Meyer noted additional repeating properties. Mendeleev put it all together
into what has become the periodic table of the elements. The German chemist, named Dobereiner, in
1829 noted some of the first elemental similarities. His observations began with bromine, which had
just been discovered. He noticed that the properties of bromine were similar to chlorine and iodine.
Not only were they related but also various properties of bromine, including the atomic weight, fell
midway between the properties of chlorine and iodine, but also there was a pattern within the group
of regularly increasing atomic weights. As he did his research he noticed a couple other groups of
elements with patterns

The Characteristics Of Marble Coffee Tables
marble coffee table
There are many ways to make an impression each of our friends. The actual friends would certainly
keep in his or her recollection in our cordial encouraged, delicious foods, helping perspective in
addition to pleasant conduct for lengthy years of their thoughts. It's each of our pride in addition to
delight in order to encouraged each of our friends at each of our household. After they are at
household we'd end up being thrilled in addition to would certainly likewise end up being pleased to
talk to them with regards to a lot of issues. Last but not least oahu is the occasion for going for
delivering them excellent meal about the excellent approach. The actual marble coffee tables usually
are ideal for this function. Although there are several types of marble coffee tables easily obtainable
in the furnishings shop men and women like the most amazing in addition to ... Show more content
on Helpwriting.net ...
They are awesome in search, all to easy to end up being looked after, would certainly provide for
lengthy years. The actual pebble gems usually are brought in via abroad countries in addition to
soon after many techniques these are converted to a lot of things such as marble coffee tables. The
actual corian or even marbles gems are available in multi colors likewise. Now the skilled inside
corian sector have added in a few attractive features like designing the martial arts about the
marbles, generating online styles in addition to digitalized styles inside pebble furnishings products.
Seeing that most of these pebble tables usually are mineral water proof the furnishings things may
not end up being damaged together with mineral water if it is leaking when having the meal about
the pebble tables. Within hotels in addition to marble coffee tables, folks are having his or her coffee
about the marble coffee tables solely than every other tables seeing that it is quite all to easy to end
up being washed in

History Of The Periodic Table
The History of the Periodic Table Throughout history the periodic table of elements has been
influenced and amended by multiple scientists. These scientists include Johann Dobereiner, A.E
Beguyer de Chancourtois, John Newlands, and Glenn Seaborg. As well as Dmitri Ivanovich
Mendeleev and Lothar Meyer the creators of the periodic table. There are many ways that the
periodic table of elements was set out. For example the table can be organized using patterns
between atomic numbers, electronegativity, ionization energy, structure (gas or solid) valence
electrons and electron configuration (shells) as seen in the modern day periodic table. Before history
was recorded humans had knowledge of certain elements including gold (Au), copper (Cu), silver
(Ag), mercury (Hg), tin (Sn) and lead (Pb). Nevertheless, it wasn't until the year of 1669 that Hennig
Brand discovered the very first element – Phosphorous (P) – through scientific inquiry. Hennig
Brand discovered phosphorous through extracting it from urine. Due to the element having the
ability to grow in the dark it was referred to as "light bearer". In 1980 English chemist Robert Boyle
discovered phosphorous independently, following Hennig Brand keeping the process of his
discovery secret. Additionally, Johann Dobereiner began grouping elements with like properties into
triads – groups of 3 elements – between 1817 and 1829. His work began in 1817 after he noticed
that the atomic weight of Strontium (Sr) was medially between the

How Has The Periodic Table Changed
The world of chemistry is based on the periodic table so without it there would be no chemistry. It
has forever changed how people learn about and understand the elements and chemistry itself. The
periodic table is named this because the elements are placed into periodic groupings based on their
relations to one another. The periodic table has changed a lot over the years in order to develop into
the periodic table used today. Hundreds of years have gone by and many people have contributed to
creating the periodic table. A lot of predictions, trial and error, adjustments, and improvements have
been made so that the current periodic table could be as accurate as possible. Many steps were
required for the periodic table to even be created. For example, before ... Show more content on
Helpwriting.net ...
The very first element, Phosphorous, was discovered in 1649 and was then followed by a series of
elements (gold, silver, tin, copper, lead & mercury). By 1869 there had been 63 elements discovered,
enough elements to start recognizing a pattern among them. Johann Dobereiner was one of the first
people to recognize a pattern and he came up with the Law of Triads. The Law of Triads states, "that
nature contained triads of elements where the middle element had properties that were an average of
the other two members when ordered by the atomic weight". He discovered the Halogen and Alkali
Earth Metal triads along with starting to group other elements. A.E. Beguyer de Chancourtois was
the first person who should be credited with the first model of the periodic table in 1862.
Chancourtois had placed the elements on a cylinder by their increasing atomic weight so that closely
related elements were vertically aligned. He stated that the properties of elements are the properties
of numbers and predicted stoichiometry. After Chancourtois, John Newlands, in 1863, classified the
56 known elements into

Dinner Table Dialectical Journal
Dinner Table The man sat with a tangible animosity, and his wife trembled over sudsy dishes. He
sipped cooly at his drink. The slight figure of his son slipped into the room, desperate not to be
noticed. He sat down without meeting his father's gaze. His eyes were a cold blade pressed against
the child's dirt smeared face. "You're filthy." He slurred. "I'm sorry," the child's voice was painfully
quiet. His wife stepped forward with their plates, setting them down without a word. Anything could
set him of, and the result would be less than pleasant. They ate in silence, which hung heavily in the
air. The boy reached out for his glass, and it tumbled over itself. Each shard seemed to fly on it's
own accord, desperate to escape the

Different Types of Fact Tables
Dimension –
A dimension table typically has two types of columns, primary keys to fact tables and
textualdescreptive data.
Fact –A fact table typically has two types of columns, foreign keys to dimension tables and
measures those that contain numeric facts. A fact table can contain fact's data on detail or aggregated
level. Types of Dimensions –
Slowly Changing Dimensions: Attributes of a dimension that would undergo changes over time. It
depends on the business requirement whether particular attribute history of changes should be
preserved in the data warehouse. This is called a Slowly Changing Attribute and a dimension
containing such an attribute is called a Slowly Changing Dimension. Rapidly Changing Dimensions:
A ... Show more content on Helpwriting.net ...
Non–Additive:
Non–additive facts are facts that cannot be summed up for any of the dimensions present in the fact
table.Eg: Facts which have percentages, ratios calculated. Factless Fact Table: In the real world, it is
possible to have a fact table that contains no measures or facts. These tables are called "Factless Fact
tables".
Eg: A fact table which has only product key and date key is a factless fact. There are no measures in
this table. But still you can get the number products sold over a period of time.
Based on the above classifications, fact tables are categorized into two:
Cumulative:
This type of fact table describes what has happened over a period of time. For example, this fact
table may describe the total sales by product by store by day. The facts for this type of fact tables are
mostly additive facts. The first example presented here is a cumulative fact table.
Snapshot:
This type of fact table describes the state of things in a particular instance of time, and usually
includes more semi–additive and non–additive facts. The second example presented here is a
snapshot fact table.
About these ads
Types of Facts in Data WarehouseTypes of Facts in Data Warehouse
A fact table is the one which consists of the measurements,

Task 1a Periodic Table Essay
TASK 1A Periodic table essay
Also you should organise into F blocks and S, P, D blocks.
Which groups and blocks belong too?
NA– Sodium
K– Potassium
CA– Calcium
MG– Magnesium
C– Carbon
O– Oxygen
N– Nitrogen
F– Fluorine
CL– Chorine
FE– Iron
H– Hydrogen
S– Sulphur
Groups
Group 1= Alkali metals
Group 2= Alkaline earth metals
Transition metals
Group 3 = Boron family
Group 4= Carbon family
Group 5= Nitrogen family
Group 6= Oxygen family
Group 7= Halogen family
Group 8= Noble gases
Rare earth materials
Some earth materials are radioactive. The earths that are rare are silvery white. Thirty rare earth
elements are unmoved in the actinide and lanthanide series. In the lanthanide series the one element
is the most of the elements in ... Show more content on Helpwriting.net ...
Families/ Groups
Columns of elements are called families or groups. Elements in the family have similar that are not
identical properties. For example, Lithium (LI) Sodium (NA), Potassium (K), and some other
members of group's family are soft with white shiny metals. The elements in the family have the
same amount of numbers of outer electrons.
Each horizontal row of the elements is called a period. The elements in the period are not like in

properties. In fact, the properties change greatly across even given row (periodicity). The first
element in the period is always an extremely solid that is active. The last element in the period is
always an inactive gas. Each new period will represent the next shell fall of electrons which will fill
the period.
Hydrogen group
Hydrogen rests at the summit of group yet it is not a representative of that family. Hydrogen is
inside a category of its own. Gas at free space temperature.
Alkali metals group 1
Never found while complimentary component within mature– repeatedly joined with another
section. 1 outer electron stability of clay, simply shaped with a knife. Conduct electricity. The most
reactive metals. They proceed dangerously with water. While you progress throughout the group
huge atoms (since there's only full shell. Outside for each row2 this is more react line although the
outer electron is further simply lost while it's further away from the cell. Higher thickness since the
atoms possess of

Origins Of The Periodic Table
As we know, today there are one–hundred and eighteen elements on the periodic table of elements,
but it didn't start out like this. Robert Boyle, a scientist, discovered the element phosphorus in 1680.
Also, in this year the element became known to the public. By the year of 1809, the number of
elements discovered at the time was up to 47. Also, scientists began to see a pattern in the
characteristics of the elements. Later in 1863, The 56 elements discovered at the time were then
divided into 11 groups based on their characteristics by an english chemist named John Newlands.
In the year 1869 a Russian chemist by the name of Dimitri Mendeleev started the making of the
periodic table. He started by rearranging the elements in order of atomic mass. He also expected the
discovery of other elements, so he decided to leave empty spaces in his table so he could add new
elements later. In 1894, the noble gases were discovered by Sir William Ramsay and Lord Rayleigh.
The noble gases were added to the periodic table in a group labeled 0. Eventually in 1945, Glenn
Seaborg discovered and identified lanthanides and actinides. The Lanthanides were the elements
with atomic numbers greater than 57 and lower than 71. The Actinides were elements greater than
92. These elements today are located underneath the periodic table (refer to figure 1). The last major
change to the periodic table occurred in the 20th century due to the work of Glenn Seaborg. starting
with his

Dmitri Mendeleev : The Periodic Table Of The Elements
The periodic table of the elements was published in 1869 by Dmitri Mendeleev. He shows the
elements in order according to the atomic weight. A pattern where similar properties for elements
occur periodically. With the work of of the physicist Henry, the periodic table was known on the
basis of increasing atomic number rather than an atomic weight. This table can be used to predicts
the properties of elements that had not been discovered yet. It lists elements, in other words number
of protons in every atom. Elements are arranged in rows or periods. There are 7 periods each period
is filled by atomic number. The atomic number is the number of protons each atom has. Almost 120
elements are known. Chemists have learned that 95 percents of your body is made up of some
elements on the periodic table. In chemistry any material that can't be broken down into is known as
the elements of science. The order the periodic table is shown shows the trends, like the elements
with similar behavior in the same column. This table is known as the periodic table because the rows
are called periods. Dmitri was late submitting all his work on the 63 elements. For him to rush
things he made a database.Most of the elements on the periodic table are metals. About 75 percent
are metals . Metals are usually shiny and most melt at high temperatures. These metals on the
periodic table are divided into separate groups, such as basic metals,transition metals,alkali
metals,alkaline earth metals,rare earth, lanthanides, and actinides. All of the metals are solid at room
temperature except mercury . Mercury is a liquid. Up until medieval times there was only 7 metals
known. These elements back then were called the Metals of Antiquity. Most of these metals are
good conductors of heat and electricity. Most metals are very hard,malleable or may be beaten into a
thin sheet. Many of these metals are ductile or capable of being draw into a wire. They also make a
sound like a bell when being struck. These metals tend to bend rather than just break. Metals that are
known as metalloids have properties of both metals and nonmetals. Noble metals resist oxidation in
moist air. Most precious metals have a meaning or importance. Six non metals occur as

Silver On The Periodic Table
Silver is an element that is found on the Periodic Table. The element silver is symbolized on the
periodic table with the letters Ag. The symbol Ag of silver comes from a latin word for silver which
is argentum. Silver on the Periodic Table is found in group 11. Silver has an atomic number of 47.
The atomic number determines the chemical properties of an element and is placed on the top of the
symbol on the periodic table. The mass number of the element silver is 107. To determine the atomic
number you use the number of protons and neutrons in the element. Silver has 60 neutrons which is
a subatomic particle found in the nucleus of every

How Was The Periodic Table Discovered?
How was the Periodic Table Discovered? The periodic table is one of the most known things in
science. It has elements, metals, non–metals, solids, liquids and gases. The beginning of the periodic
table starts back in 1669 when a German merchant and alchemist named Hennig Brad began
creating a Philosophers Stone. He then discovered Phosphorus. A few years later in 1809 47
elements had been discovered, in 1863 chemist John Newlands began forming the elements in
groups and discovering more which was a total of 56 he divided them into 11 groups. The
development of the periodic table began in 1869 by a man named Dimitri Mendeleev arranging the
element by there atomic mass he also thought of other elements that may be discovered eventually
so he

Roman Twelve Table Essay
What does it Say?
The Roman Twelve tables are twelve tables that were created as a code of law. Each table explains
the title of that code/law thoroughly. The tables are as follows: Table 1: Procedure: for courts and
trials. Table 2: Trials, continued. Table 3: Debt. Table 4: Rights of fathers (paterfamilias) over the
family. Table 5: Legal guardianship and inheritance laws. Table 6: Acquisition and possession. Table
7: Land rights. Table 8: Torts and delicts (Laws of injury). Table 9: Public law. Table 10: Sacred law.
Table 11: Supplement Me. And Table 12: Supplement II.
What was it designed to do?
The Roman Twelve Tables was mostly designed for what was considered an agricultural community.
They were designed to restrain Roman citizens from committing certain unappreciable acts ... Show
more content on Helpwriting.net ...
For the time it was written it does a good job at covering most of the basis especially for the
agricultural community that Rome was. Comparing the twelve tables to the essence of our
governmental policies now I can see where some things from then have been applied to our rules of
governing in modern times. Some of those things that our still applicable today come from table 1,
those being: "Everyone is innocent until proven otherwise, everyone has the right to defend
themselves in front of a judge, and the judge must take every piece of evidence into

The Development Of The Periodic Table
Chemistry Research assignment
OUTLINE the history of the development of the Periodic Table including its origins, the original
data used to construct it and the predictions made after its construction. (Include references to the
contributions made by Antoine Lavoisier, Johann Dobereiner, John Newlands, Dmitri Mendeleev,
Lothar Meyer, William Ramsay, Henry Moseley, J.J. Thomson and Niels Bohr.
In 1803 a man by the name of John Dalton Proposed that matter was comprised of atoms that were
very simple and solid with no structure. He also put forward that each element was different from
each other with different atomic weights. J.J. Thomson first discovered the electron in 1897 which
lead to him developing a new model of the atom in 1904 – 1909, this new model is often referred to
as the plum pudding model due to Thomson visualizing the atom as a positive sphere in which
negative electrons embedded into it. Thomson envisaged the electrons to have some sort of structure
or pattern to them rather than just loose as the name, plum pudding implies. Earnest Rutherford
Developed an atomic model in 1911 called the planetary model. This model has positive protons in
the nucleus with negative electrons orbiting it like the sun. He developed this model due to him
discovering the nucleus. Later in 1913 Niels Bohr Realised that the electrons that orbit the nucleus
must occupy stable, non–radiating orbits. This led to him developing the Bohr Model which was
electrons occupying stable shells

Physics Of The Periodic Table
The Periodic Table
Chemically speaking, the periodic table was a major factor in improving the study of elements, in
which then the study of these elements expands into broader studies such as atoms and sub–atoms.
This essay will talk about the history of the development of the periodic table and will further
discuss the how and why it was created. Moreover, it will include the history of various chemists
that contributed in the improvement of the table such as Johann Wolfgang Döbereiner, John
Newlands, Dmitri Mendeleev, Henry Moseley, Glenn T. Seaborg.
The periodic table is a tabular arrangement of the chemical elements, organized on the substratum of
their atomic number (number of protons in the nucleus), electron configurations, and ... Show more
As a result, a periodic table provides an utilizable framework for analyzing chemical manner, and so
the tables, in diverse forms, are widely utilized in chemistry and other sciences.
In 1817, Johann Wolfgang Döbereiner commenced to formulate one of the earliest endeavours to
relegate the elements. In 1829, he found that he could compose some of the elements into groups of
three, with the members of each group having cognate properties. He termed these groups as triads.
Some of the triads that were relegated by Döbereiner are chlorine, bromine, and iodine, also
calcium, strontium, and barium, and sulfur, selenium, and tellurium and finally lithium, sodium, and
potassium. In all of the triads, the atomic weight of the middle element was virtually precisely the
average of the atomic weights of the other two elements.
In 1865, few years after the discovery of the triads, the English chemist John Newlands relegated the
fifty–six kenned elements into eleven groups, predicated on their physical properties. Newlands
noted that many pairs of like elements existed, which differed by some multiple of eight in mass
number, and he was the first to assign them an atomic number. When his 'law of octaves ' was
printed in Chemistry News, likening this periodicity of eights to the musical scale, it was ridiculed
by some of his contemporaries. His lecture to the

The Green Table Kurt Jooss Essay
Paulina Milewska
Kurt Jooss' The Green Table
Expressionism can be described as a movement in the fine arts that emphasized the expression of
inner experience rather than realistic portrayal, looking to obtain not objective reality, but the
subjective emotions and responses that objects and events arouse in the artist. Several characteristics
of expressionism are distortion, exaggeration, primitivism, and fantasy. "The Green Table," a ballet
by Kurt Jooss, 1932, is an ideal example of expressionism because it depicts the choreographer's
personal interpretation of war through the use of movement, music by Fritz Cohen and lighting by
Hermann Mankard.
The Green Table is a piece of performance created mostly by Kurt Jooss, the piece lasts ... Show
more content on Helpwriting.net ...
However, movement is not his only means of self–expression.
The music accompaniment to this piece comes from one or two pianos which works well with the
dance so that neither one overshadows the other. There are no other instruments used, the melody of
the piano changes from scene to scene in order to project Jooss' emotional responses. During the
scenes with the politicians, the air of the piano is light–hearted and almost comedic. The story
begins with the politicians in masks that are arguing in a non–naturalistic way using their postures
and gestures for example: standing up with masks facing the audience wearing white gloves
reaching their hands out with open palms portraying careless emotion. The show ends the same way
which gives an impression of Jooss trying to say that there will always be arguments between higher
statuses that don't help the general public but they use their powers for their own entertainment. The
purpose of this was to show the detachment of these men from the war. They are in a safe situation,
unexposed to war and death. When the scene changes and we see what's happening in the lives of
citizens, this tune is transformed into a thunderous and eerie song that haunts the audience. The
reason for this change is to reveal Jooss' feelings about the unnecessary brutality and death that
always comes with a war, and how politicians don't understand the horror

The Periodic Table : Potassium, Sulfur, And Krypton
The Periodic Table contains 118 elements, all different with shape, size, and what it's made up of.
Out of the 118, 3 were chosen and they will be discussed later in this paper. Those elements are
Potassium, Sulfur, and Krypton.
The first is Potassium. Potassium was first discovered and isolated by Sir Humphrey Davy, a
Cornish chemist and inventor, in 1807. Potassium is highly reactive, but Davy isolated the element
through a process what's called electrolysis, a process by which an electric current is passed through
the element to cause chemical change within the element. Potassium could be extracted through
minerals such as carnalite, langbeinite, and polyhalite minerals. Potassium is also found in the
Earth's crust, and makes up around 1.5 to 2% of the Earth's crust. Potassium also can't be found in
nature as a free element. Potassium is atomic number 19 in the periodic table and is symbolized as
the letter "K" in the periodic table. The element is in Group 1, Period 4 on the periodic table. The
element is an alkali metal and has somewhat of silver color to the element. The structure of the
element has a cubic shape at room temperature and has a density of 0.862 g/cm
Elnaka 2 cubed. The melting and boiling point of the element are 63.65 °C (146.57 °F) for melting
and 759.0 °C (1398°F) for boiling. The atomic mass of the element is 39.0983 amu (atomic mass
unit). The element is made up of 19 protons, 19 electrons,

Essay about periodic table
The History of the Periodic Table of Elements Dmitri Mendeleev and the early Periodic Table
Dmitri Mendeleev was born in Tobolsk, Siberia; on February 7, 1834 .He was the youngest of 14
children born to Maria Dmitrievna Korniliev and Ivan Pavlovitch Mendeleev. His father was
director of the local gymnasium. Maria Korniliev's family settled in Tobolsk in the early 1700's and
introduced paper– and glass–making to Siberia. Unfortunately, Ivan died when Dmitri was quite
young, leaving his wife to support the large family. The death hit them hard economically especially
for a large family, which meant that Maria had no other choice but to find work. Maria's family
owned a glass factory and they allowed her to take over managing the company so ... Show more
Petersburg and defended his master's thesis: "Research and Theories on Expansion of
Substances due to Heat." Following his masters program, Dmitri focused his life on his career
of teaching and research. He was essentially a teacher devoted to his work .The first led to his books
and the periodic table. In 1859, he was assigned by the Minister of Public Instruction to go abroad to
study and develop scientific and technological innovations. Between 1859 and 1861 he studied the
densities of gases with Regnault in Paris and the workings of the spectroscope with Kirchoff in
Heidelberg. He also tested for the critical temperature. While in Heidelberg he met A.P. Borodin, a
chemist .In 1860 at the Chemical Congress at Karlsruhe, Mendeleev had the opportunity to hear
Cannizzaro discuss his work on atomic weights.
Following his trip abroad, the Russian chemist returned to his homeland where he settled down to a
life of teaching and research in St. Petersburg. In 1863 he was named Professor of Chemistry at the
Technological Institute and, in 1866, he became Professor of Chemistry at the University and was
made Doctor of Science for his dissertation "On the Combinations of Water with
Alcohol". As will be seen, his research findings were expansive and beneficial to the Russian
people. Dmitri was always in touch with the classroom. Much of his lab work, including that on the
periodic chart, occurred in his spare time following his

Questions On The Periodic Table
INTU Statement
I need to understand the various arrangements of elements and its similarities to the periodic table
given in the Nelson Chemistry 11 textbook.
Periodic Table
The periodic table is the chemicals arranged in order of increasing atomic number and grouped with
similar chemical properties. There are 7 periods and 18 groups in the periodic table. The periodic
table used in the textbook has a total of 118 elements.
About Dmitri Mendeleev Dmitri Mendeleev also known as the Russian scientist who was born in
Tobolsk, Siberia. Mendeleev was one of 17 children in his house hold. He is known for the periodic
table we use today which was created in 1869. Although at the time he only had 65 elements, his
periodic table was the one that stood out the most with, elements organized in increasing atomic
weight and grouping them by similarity of properties. Throughout the years more and more elements
were being discovered and in total there are 118 elements. What Dmitri did to discover the periodic
table was that he wrote all of the 65 elements on separate cards and wrote the atomic weight along
with the properties. He re–arranged the cards so that he could find a pattern which he did and wrote
it on a piece of paper. He later on published the periodic table in the Principles of Chemistry in
1869. Dmitri also received many awards one example was the Chair of General Chemistry at the
university of Saint Petersburg.
Alternative Proposal ( answering question 10 on pg 33)

Early Periodic Table
From discovering elements, to the creation of the periodic table, to determining new trends,
scientists continue to build upon and enhance existing knowledge of the basic components of
chemistry. Chemists, as well as many other researchers, rely heavily on the periodic table of
elements and its many properties that are widely accepted and believed to hold true. These elements
are arranged on the periodic table according to their atomic number or the number of protons in the
nucleus. How the properties of the elements correspond to their placement on the table is referred to
as the periodic law or periodicity. The periodicity of early periodic tables was mostly relevant and
accurate and for the lighter elements, those located in the first five rows of the periodic table,
because they were more easily accessible and cheap. However, for the heavier elements starting in
row six, some ... Show more content on Helpwriting.net ...
The heavier elements in these groups are harder to research because of their limited availability and
therefore are not studied as much as the lighter elements. However, it has been discovered for the
heavier elements, relativity begins to stabilize the s and p orbitals while destabilizing the d and f
orbitals, which can alter their properties. For an atom, the number of bonds it can make depends on
the free valence electrons and the molecular orbitals. So far, a bond order of six has been the largest
amount discovered for an atom and contains two sigma bonds, two pi bonds, and two delta bonds.
This is true for most of the elements located in group six of the periodic table, tungsten (W) and the
lighter elements chromium (Cr) and molybdenum (Mo). However, the largest element in this group,
seaborgium (Sg), has considerably different properties and a bond order of four. Researchers used
the wave function and density functional theories to analyze the differences in properties of these
group six

History And Development Of The Periodic Table
History and Development of the Periodic Table
Ben Madden
10B
Part A: Timeline of the Periodic Table
0
Ancient Greeks believed that everything was made of four elements mixed together in different
proportions. These elements were fire, water, air and earth.
1661
Robert Boyle had an assumption that an element was an individual substance that could not be
broken down further into a smaller substance through the process of a chemical reaction. Boyle's
assumption is considered to be the beginning of modern chemistry.
1789
Antoine Lavoisier created a list of substances that he considered to be elements. He separated his list
of 33 elements into metals and non–metals. Some items on the list were classified as compounds
because they could not be determined to be otherwise, because of the lack of technology and
equipment available at the time.
1820
Jakob Berzelius began to replace the patterns which represented chemical symbols with
abbreviations for the element. He developed a system of organisation based on the weight of an
element, with hydrogen having a value one, and all other elements having a higher value. He used
one universal system.
1829
More chemists began studying elements and their properties. Johann Dobereiner identified 40
elements and noticed similar properties between the elements. He noticed that different groups of
elements had a similar atom structure.
1864
John Newlands identified that every eighth element had a similar structure and came

The Physics Of The Periodic Table
Group 14 of the periodic table contains a mixture of non–metals (carbon and silicon), a metalloid
(germanium), and two metals ( tin and lead). Tin is able to form dihalides and tetrahalides such as
SnI2 and SnI4. However, lead will not form tetrahalides as readily as tin3. The tetrahalides of lead
will decompose into dihalides due to their instability 3. The stability of the compounds is based on
their respective oxidation states. Periodic trends suggest that group 14 oxidation states are normally
– 4 as it is increasingly energetically favorable for them to accept electrons in order to complete
their valence shells 3. However, due to the metallic properties of tin and lead, they generally lose
electrons and therefore have a positive oxidation state. It is a characteristic trend to see heavier
elements of the p block forming compounds in which their oxidation number is 2 (less than the
group number 3 ). The heavier the atom, the more stable it is in the lower oxidation state. This is due
to the inert pair effect 3. This can be correlated to the amount of energy needed to remove an
electron (ionization energy), since in the higher oxidation state the p–block electrons and the s–
block electrons are removed, while in the lower oxidation state, it is only the p–electrons that are
removed and thus, the overall ionization energy is lower. The general periodic trend is that the
ionization energy is generally lower for heavy metals, which results in the lower oxidation state
being

Bridal Table Essay
Your Aunt Carole and Uncle Earl have been feuding since the 80s, your last single girlfriend is
hypersensitive to being seated at the "wrong" table, and you have one couple coming from out of the
country who only know you. Or perhaps your parents are divorced. How can you please everyone?
Seating dilemmas have cost brides and grooms many sleepless nights before the big day. You want
every guest to feel special, but if you have to rearrange that seating chart one more time, you 're
going to lose it. What to do? With a little tact, diplomacy and common sense (along with those deep
breathing exercises you learned in yoga), you can create a seating plan that will make almost
everyone happy.
gift giving and receiving Why A Formal Seating ... Show more content on Helpwriting.net ...
Speak to your caterer or wedding coordinator to determine this. If not, you might simply designate
the bridal table with place cards, and allow the other guests to seat themselves. Some couples opt to
have a cocktail party or buffet with a few tables, in hopes that guests will "alternate" sitting and
eating. If this is what you plan to do, make sure that your elderly guests have a place to sit down,
possibly even by designating a separate table for them.
Who Sits Where?
The Bridal Table. The bride and groom may sit at a long rectangular head table or round table at the
focal point of the room, or alternatively, at their very own "sweetheart" table. Some couples choose
to have no table at all, but to leave a few seats empty at every table so they can mingle throughout
the reception. No matter which configuration you choose, the bridal table is usually set apart from
the others by some type of decoration, such as flowers. Classically, the groom sits to the bride 's
right and the best man sits to her left. The maid of honor sits to the groom 's right. Depending on
how large the table is, the other attendants should be scattered around. In the old days, spouses and
significant others were relegated to different tables, but let 's think about that for a minute... It seems
rather unfair to separate couples during an entire wedding dinner and dance, so be sensitive. If you
can only fit the best man and maid of honor –– along with their significant

History Of The Periodic Table Of Elements

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