Question

Valency of-
1.Sodium
2.Copper
3.Sulphite
4.Manganese
5.Sulphide
6.Nitrate

Answer 1

Valency of;

1. Sodium- 1

2. Copper- it has two valencies

Cuperous- valency- 1

Cupric- valency-2

3. Sulphite- negative 2

4. Manganese- valency - 2,4,7 due to corresponding stable electronic configuration

5. Sulphide valency - 2

But sulphide ion valency -negative 2

6. Nitrate ion valency - negative 2

Nitrate atom valency - negative 1

Hope it helps !