Question

Write down the valency of the following ions.​

Answer 1

Nitride ion, $N^{3-}$, carries a -3 charge on it. It can combine with 3 cations. Thus, its valency is 3.

Sulphide ion, $S^{2-}$, carries a -2 charge on it. It can combine with 2 cations. Thus, its valency is 2.

Oxide ion, $O^{2-}$, carries a -2 charge on it. It can combine with 2 cations. Thus, its valency is 2.