Question

what is the valancy of iron and explain how to find valancy of elements.

Answer 1

by knowing the atomic no
after that filling electron by using shells like k M N shells in the last shell the electron present is the valency

Answer 2

to find the valency of an element ,first know how many electrons are there in an atom of that element .Then distribute it in shells.Tf the outer most shell have 1,2or3 electron then it's valency is 1,2or3 if it is 5,6,7or8then it's valency will be if 5 ,8-5 ,if 6,8-6and so on.