Name
Period
Date
Atomic Structure
SUBATOMIC PARTICLES
The table below contains information about several elements. In each case, enough information
has been provided for you to fill in the blanks. Assume all atoms are neutral.
Element
Atomic
Number
# of
Protons
1.
2.
21
14
14
7
15
11
6.
25
13
29
92
8.
235
33
9.
10.
20
43
26
47
Mass
Number
24
5.
7.
# of
Neutrons
12
3.
4.
# of
Electrons
54
63
For each element, do the mass numbers match the atomic masses that appear on the periodic
table exactly? What is a possible explanation for your answer.
Atomic Structure
CHEM