Question

Pls tell me the difference between valency and atomic number

Answer 1

valency is the ability of a compound to gain loose or share electrons while atomic number is the total number of electrons in it

Answer 2

hlo frd here is your ans
{ valency} = it is only tell us about the how many electron are present in outer most shell
{atomic number } = it is tell us about the how many electron are present in atom and number of proton are present when it is neutral ( no charge contain by atom)