Question

what happens to the valence electrons and valency as we move to left to right in a period and top to bottom in a period?​

Answer 1

Answer:

On moving from left to right in a period, the number of valence electrons increases from 1 to 8. On moving from left to right in a period, the atomic size decreases; the size of the atoms decreases. ... The elements fluorine and chlorine have seven electrons in their outer shell.

Answer 2

Explanation:

The valency left to right then valency decrease $right to left valency increase