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Protons, Neutrons, and Electrons Practice Worksheet
Calculating the number of each particle in an atom:
# Protons = Atomic Number
# Electrons = Protons
# Neutrons = Atomic Mass – Atomic Number OR Big # - Small #
Use the periodic table to find the numbers of protons, neutrons, and electrons for atoms of the following
elements.
Name of Element
Element
Symbol
Atomic
Mass/Mass
Number
Atomic
Number
Protons
Neutrons
Electrons
Boron
B
11
5
5
6
5
23
11
Sodium
Y
89
Copper
39
29
Tc
98
Pb
207
Thallium
204
35
43
81
H
Carbon
0
12
N
7
Ba
56
Si
14
Calcium
Argon
18
Mg
12
12