Question

How we can find valency of an atom?

Answer 1

Valency of an atom is the number electrons in the outer most shell or valency is the number of eight minus the number of electrons the outer most shell.If one know the number of electrons then easily calculate the valency.Except hydrogen all other atoms have 2 electrons in inner most shell and up to eight electrons in ..

Answer 2

Get its electronic configuration and divide its number of electrons and then divide the numbers by 2n^2 and the last number will be the valance electron and if its a metal then its + the last nber else its -ve