Question

An element X has a valency of $4$ whereas another element Y has a valency of $1$. What will be the formula of the compound formed from X and Y?

Answer 1

Step 1: Definition of Valency

1. Valency of the element describes its tendency to combine with another element.
2. It tells the number of bonds formed by an element.

Step 2: Deriving the formula of the compound

Valency of element X = $4$

Valency of element Y = $1$

The valency of the elements will get multiplied by a criss-cross method.

Hence, the formula of the compound is ${\mathrm{XY}}_4$.