NAME ____________________________________________________ DATE __________
Atoms and Ions Worksheet
Use your periodic table to fill in the missing spaces below. Consider all atoms to be stable.
Element
Symbol
Carbon
Atomic
Mass
Protons Neutrons Electrons
Number Number
6
O
12
8
8
Potassium
19
20
Au
Tin
Sn
50
Zinc
Cobalt
69
64
Co
30
27
32
Boron
5
6
Fe
Use your periodic table to complete the table below. The first one has been done for you.
Element
Iodine
Atomic
Mass
Protons Neutrons Electrons Symbol
Number Number
53
Hydrogen
127
53
35
17
1
1
35
5
36
B+3
8
7
10
7
27
56
10
10
26
29
24
Cu+1
34
63
I-1
0
11
Nitrogen
Aluminum
54
Cl-1
45
16
Oxygen
74
29
27
Complete the following:
Match each of the positive ions listed with the total number of electrons that ion contains. Use
your periodic table. The same answer may be used more than once.
A) 2
B) 10
C) 21
D) 23
E) 24
F) 25
G) 36
H) 48
I) 76
J) 81
____ Al+3
____ Fe+3
____ Mg+2
____ Sn+2
____ Li+1
____ Cr+3
____ Rb+1
____ Pt+2
For each of the following ions, indicate the total number of protons and electrons in the ion.
Ion
Number of Protons
Number of Electrons
12
10
Cl-1
K+1
S-2
Sr+2
Al+3
P-3
1. Write the complete chemical symbol for the ion with 84 protons, 125 neutrons, and 80
electrons.
2. Write the complete chemical symbol for the ion with 27 protons, 32 neutrons, and 25
electrons.
3. Write the complete chemical symbol for the ion with 73 protons, 108 neutrons, and 68
electrons.