Question

The valency of an element X is 3 and that of oxygen is 2.What will be the formula of the compound formed by the combination of element X with oxygen?

Answer 1

X2O3 is the formula required

Answer 2

The formula of combined element will be - X2O3.

To find the chemical formula by the valency, following steps should be taken -

• Step 1 - Write the valency and element together, as shown below.

3 2

X O

• Step 2 - Cross multiply and write the element and number together.

X2O3

Thus, the chemical formula of combination is X2O3.

Valency is defined as "measure of capacity to combine with other atoms for formation of compounds or molecules."