5. Atomic number
Mass
8 Number:_______________
Number of
Protons:___________
The difference of number of neutrons in the nucleus
Number is the
Atomic
Symbol
O Neutrons:__________
3
Number of Electrons: ________
Subtract the atomic number (the # of protons= # of
electrons)from the mass number.
Oxygen
15.999
2
Round the atomic mass to the nearest whole
1
6. Mass Number:______16_______
8 Number of Protons:______8_____
Number of Neutrons:_____8_____
Number of Electrons: _____8_____
O
The difference is the number of neutrons in the nucleus
3
Subtract the atomic number (the # of protons= # of
electrons)from the mass number.
Oxygen
15.999
2
Round the atomic mass to the nearest whole
1
7. 5
Mass
Number:_______________
Number of
B Protons:___________
Number of
Neutrons:__________
Boron Number of Electrons:
_________
10.81
8. 5 Mass Number:______11________
Number of Protons:______5_____
Number of Neutrons:_____6_____
B Number of Electrons: _____5_____
Boron
10.81
9. 10 Mass Number:________20_______
Number of Protons:____10_______
Number of Neutrons:____10______
Ne Number of Electrons:
____10______
Neon
20.18
10. 10
Mass
Number:_______________
Number of
Ne Protons:___________
Number of
Neutrons:__________
Neon Number of Electrons:
_________
20.18
11. In Summary
For any element:
Number of Protons = Atomic Number
Number of Electrons = Number of Protons = Atomic
Number
Number of Neutrons = Mass Number - Atomic Number
For krypton:
Number of Protons = Atomic Number = 36
Number of Electrons = Number of Protons = Atomic
Number = 36
Number of Neutrons = Mass Number - Atomic Number =
84 - 36 = 48
Visit http://education.jlab.org/elementmath/index.html
for more practicing on protons, neutron, and mass number
12. Well then…
It’s Time for an Element
Riddle!!
Use the element name as a pun to complete these sentences.
"We brought everything
but the kitchen ______!"
Five times two is _____.
13.
14.
15. Table 1. Common Elements and Their Symbols
Al Aluminum Cu Copper O Oxygen
Sb Antimony F Fluorine P Phosphorus
Ar Argon Au Gold Pt Platinum
As Arsenic He Helium K Potassium
Ba Barium H Hydrogen Ra Radium
Be Beryllium I Iodine Si Silicon
Bi Bismuth Fe Iron Ag Sliver
B Boron Pb Lead Na Sodium
Br Bromine Li Lithium Sr Strontium
Cd Cadmium Mg Magnesium S Sulfer
Ca Calcium Mn Magnesium Sn Tin
C Carbon Hg Mercury Ti Titanium
Cl Chlorine Ne Neon W tungsten
Cr Chromium Ni Nickle U Uranium
P. 8 Co Cobalt N Nitrogen Zn Zinc
16. Well then…
It’s Time for ANOTHER
Element Riddle!!
Use the element name as a pun to complete these sentences.
" Dial 911 to call a _____ when you
witness a crime.
To park here you must put a _____ in the
meter.
