Question

An element of A forms an oxide a2o3 what is it's valency

Answer 1

Its valency will be 3 as three oxygen need 6 electron and there r 2 A so each will give 3 electron to balance the compound. This type of oxide r mainly formed by 13 group.
I just hope u understand..

Answer 2

Answer:

Valency - 3

Explanation:

The oxide A2O3 is formed by combining two atoms of a with three atoms of O. The element is also acidic in nature.

As oxides have O2- as anion , A will be the cation. The charges on the ions will be the subscript for the other elements in the formula, which means +3 for A and 2- for O. As the charge is combining capacity of the element, the valency for A is 3.

Thus, the valency for oxide A2O3 is 3.