Question

if the valency of oxygen is 2, derive the valencies of the other elements present in the following oxides:
a) Sodium oxide (Na2O),Zinc oxide(Zno),Lead oxide(PbO),Aluminium oxide(Al2O3)and Calcium oxide(CaO)

Answer 1

Steps:
1) Valency of oxygen is 2 .
We know valency of one element is equally distributed to identical atoms.

a) Na2O.:
Valency of 2 Na,Sodium = Valency of O
=>2 * Valency of Na, Sodium = 2
=> Valency of Na= 1

b) Zinc Oxide (ZnO) :
Valency of Zn, Zinc = Valency of O
=> Valency of Zn = 2

c) Lead Oxide (PbO) :
Valency of Pb = Valency of O
=> Valency of Pb (Lead) = 2

d) Aluminium Oxide (Al2O3) :
Valency of 2 Al = Valency of 3 O
=>2 * Valency of Al = 3*2
=> Valency of Al = 3

e) Calcium Oxide (CaO) :
Valency of Ca = Valency of O
=> Valency of Ca = 2