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Question

Names and symbols of the constituent element and identify their valencies from the molecular formula.

1.KCl
2.HBr
3.MgBr2
4.K2O
5.NaH
6.CaCl2
7.CCl4
8.HI
9.H2S
10.NA2S
11.FeS
12.BaCl2

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Solution

KCl
k- potassium, valency +1
Cl-chlorine, valency -1
HBr
H- hydrogen,valency +1
Br- bromine,valency -1
MgBr2
Mg- magnesium,valency+2
Br- bromine,valency -1
K2O
K- potassium, valency+1
O-oxygen,valency -2
NaH
Na- sodium ,valency +1
H-hydrogen, valency -1
Cacl2
Ca-calcium,valency +2
Cl- chlorine,valency -1
CCl4
C- carbon,valency +4
Cl-chlorine,valency -1
HI
H- hydrogen,valency +1
I- Iodine, valency -1
H2S
H-hydrogen, valency +1
S-Sulpher,valency -2
Na2S
Na- sodium,valency+1
S- sulphur,valency-2
FeS
Fe-iron,valency +2
S -sulpher,valency -2
BaCl2
Ba-barium,valency +2
Cl-chlorine,valency-1
​​​​​​


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