# What is the valency of sodium oxide

1.Sodium in Na2 S

Valency of Na is 1 and oxidation state is +1

Valency of S is 2 and the oxidation state is -2

2.Nitrogen in N O2

Valency of N is 4 and oxidation state is +4

Valency of O is 2 and the oxidation state is -2

3.Nitogen in N H3

Valency of N is 3 and oxidation state is +3

Valency of H is 1 and the oxidation state is -1

4.Sulphur in H2 S

Valency of H is 1 and oxidation state is +1

Valency of S is 2 and the oxidation state is -2

5.Phosphorus in P2 O5

Valency of P is 5 and oxidation state is +5

Valency of O is 2 and the oxidation state is -2

6.Aluminium in Al2 O3

Valency of Al is 3 and oxidation state is +3

Valency of O is 2 and the oxidation state is -2

7.Magnesium in Mg3 N2

Valency of Mg is 2 and oxidation state is +2

Valency of N is 3 and the oxidation state is -3

8.Calcium in CaO

Valency of Ca is 2 and oxidation state is +2

Valency of O is 2 and the oxidation state is -2

Valency can be calculated based on the availability of electrons for bonding or in other terms, no. of electrons take part in bonding

Oxidation represents the number of electrons donated or gained. If the element has positive oxidation state means, it donates electrons for bonding and if the oxidation is negative value means it accepts electrons for bonding. In other term, electrons donated or gained is to attain the noble electronic configuration (Completely filled orbitals)

9.Zinc Carbonate

Formula is ZnCO3

Valency of Zn is 2 and oxidation state is +2

Valency of C is 4 and the valency of O is 2 , but overall oxidation state for CO3 is -2

The electronic structure of (CO3) 2- is ---O---C(=O)---

10.Ammonium sulphide

Formula is (NH4)2 S

Valency of N is 3 and the valency of H is 1 , but overall oxidation state for NH4 is +1

Valency of S is 2 and oxidation state is -2

11.Barium chloride

Formula is BaCl2

Valency of Ba is 2 and oxidation state is +2

Valency of Cl is 1 and oxidation state is -1

12.Sodium nitrate

Formula is NaNO3

Valency of Na is 1 and oxidation state is +1

Valency of N is 3 and the valency of O is 2 , but overall oxidation state for NO3 is -1

13.Ferric Sulphate

Formula is Fe2 (SO4)3

Valency of Fe is 3 and oxidation state is +3

Valency of S is 6 and the valency of O is 2 , but overall oxidation state for SO4 is -2

14.Calcium Carbonate

Formula is CaCO3

Valency of Ca is 2 and oxidation state is +2

Valency of C is 4 and the valency of O is 2 , but overall oxidation state for CO3 is -2

15.Potassium dichromate

Formula is K2Cr2 O7

Valency of K is 1 and oxidation state is +1

Valency of Cr is 6 and the valency of O is 2 , but overall oxidation state for Cr2 O7 is -2

16.Sodium nitrite

Formula is NaNO2

Valency of Na is 1 and oxidation state is +1

Valency of N is 3 and the valency of O is 2 , but overall oxidation state for NO2 is -1

17.Copper (II) oxide

Formula is CuO

Valency of Cu is 2 and oxidation state is +2

Valency of O is 2 and oxidation state is +2

18.Sodium zincate

Formula is Na2 ZnO2

Valency of Na is 1 and oxidation state is +1

Valency of Zn is 2 and the valency of O is 2 , but overall oxidation state for Zn O2 is -2