Question

What happens to the valency of elements as we move from left to right in a Periodic Table?

Answer 1

Explanation:

On moving from left to right in a period, the number of valence electrons decreases from 8 to 1. - As a result, valency across a period first increases and then decreases.

Answer 2

Answer:

As we move from left to right number of election decreases in outermost orbit. As a result it's atomic mass also decreases.