Question

what decides the losing or gaining of the electron?

Answer 1

Valency of the electron determine the gaining and losing of an electron.. if the valency is more than four... The atom will try to gain the electron as gaining 3 electrons is more easier than losing 5 electrons... But if the valency is less than four then the atom will lose elctrons as losing 3 more easier than gaining 5 electrons... In a rare case like carbon.. where the valency is four... the atom can either gain electrons lose all the electrons to become stable