1
Q
O2
Oxygen
A
2
2
Q
H2
Hydrogen
A
1
3
Q
Na
Sodium
A
1
4
Q
Ag
Silver
A
1
5
Q
Ca
Calcium
A
2
6
Q
Zn
Zinc
A
2
7
Q
Mg
Magnesium
A
2
8
Q
S
Sulphur
A
2
9
Q
Ba
Barium
A
2
9
Q
K
Potassium
A
1
10
Q
Cu
Copper
A
1 or 2
11
Q
C
Carbon
A
4
12
Q
N2
Nitrogen
A
3
13
Q
Al
Aluminium
A
3
14
Q
Fe
Iron
A
2 or 3
15
Q
Cl
Chloride
A
1
16
Q
CO3
Carbonate
A
2
17
Q
HCO3
Bicarbonate
A
1
18
Q
SO4
Sulphate
A
2
19
Q
NH4
Ammonia
A
1
20
Q
Br
Bromine
A
2
21
Q
OH
Hydroxide
A
1
Valencies
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