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