Question

what is valency?how it can be find out

Answer 1

When determining the valency of an atom or molecule (one for which you can't use the periodic table to determine valency), chemists use the octet rule. ... When an atom or molecule has from one to four electrons in its outer shell, it has a positive valency, meaning it donates its free electrons.

Answer 2

valency is the combining capacity of element it can be find by electron configuration