1. Atomic Structure Worksheet
USE THIS TO HELP YOU!!!

2. PROTONS- I need to know the number of protons…..
Do you have a periodic table of elements? If so, the number of protons is the same as the atomic number, the smaller number.
Do you know the atomic number? If so, then they are the same number.
Do you know the number of electrons? If so, then they are the same number.

3. ELECTRONS- I need to know the number of electrons…..
Do you know the atomic number? If so, then they are the same number.
Do you know the number of protons? If so, then they are the same number!

4. ATOMIC NUMBER- I need to know the atomic number…..
Do you have a periodic table of elements? If so, then find the number the periodic is organized by, and that is the atomic number.
Do you know the number of electrons? If so, then they are the same number.
Do you know the number of protons? If so, then they are the same number.

5. ATOMIC MASS / WEIGHT- I need to know the atomic mass / weight…
Do you have a periodic table of elements? If so, find the largest number (number with the greatest value) and round it to the nearest whole number, if necessary.
Do you know the number of protons and neutrons? If so, add the number of protons and neutrons to get the atomic mass / weight.
Number of Protons
+ Number of Neutrons
ATOMIC MASS / WEIGHT

6. NEUTRONS- I need to know the number of neutrons…..
Do you know the atomic mass / weight AND the number of protons? If so, subtract the number of protons from the atomic mass/ weight.
ATOMIC MASS / WEIGHT
-- NUMBER OF PROTONS
NUMBER OF NEUTRONS