How the valency vary in period from left to right and group from top t

1.	How the valency vary in period from left to right and group from top to bottom
Answer» ANSWER: Valency doesn't change down the group, but valency increases from L to R of the period Explanation:

How the valency vary in period from left to right and group from top to bottom

Answer»

Valency doesn't change down the group, but valency increases from L to R of the period

Explanation: