Name: _______________________________________________ Date: _____________________ Block: _____________
Particle Counting Practice Worksheet #2
Directions: Complete the following in preparation for the Particle Counting Mini Quiz. There is a periodic table attached
for your use as needed. This worksheet is OPTIONAL as it is just for extra practice if needed.
1. Look at the information about the following ions. Complete the chart. There are six blanks to fill.
Atom or Ion 
Chlorine-1 (-1 ion)
Chlorine Atom
Protons
Neutrons
Electrons
Which subatomic particle determines the charge? _________________________________________________________
2. Complete the table below. You may need your periodic table!
Element
Atomic #
Atomic Mass
O (oxygen)
Protons
Neutrons
Electrons
Charge
16
0
33
36
Cu (copper)
15
16
15
18
64
Al-3 (aluminum)
13
-3
K+1 (potassium)
18
+1
Identify the number of each subatomic particle in the atoms/ion below.
18
0
56
Ar
39.9
+2
53
Ba
137
-1
18
I
126.9
0
Ar
41
The Periodic Table of Elements