Question

valency of an element X is 3 . write the chemical formula of its oxide

Answer 1

valency given as 3
so, it is a metal

metals worth three valency is
alluminium

oxide is al2(oh)3

Answer 2

Answer:

The chemical formula of the given oxide is X2O3.

Explanation:

The valency of element X is 3 and the valency of oxygen( in oxide) is 2.

As we know, while writing the chemical formula of any compound, we interchange the valencies of the two elements and form the final formula.

Here, XO is required but for finding the proper formula we need to write it as X2O3.