Question

how does the number of Valence Electrons and valency vary on moving from left to right in the second Period of the periodic table

Answer 1

from left to right in 2 nd period
valence electrons vary from 1 to 8
and
valency first increase from 1 to 4 and then decrease from 3 to 0

Answer 2

as we move left to right in a period no. of valence electron increases from 1 - 8

and

valency of the element increases from 1 to 4 then decreses to 0


hope its help