Question

Write the valencies of the following ions:
(a) Nitride ion
(b) Ammonium ion
(c) Hydrogen carbonate ion
[3 Marks]

Answer 1

(a) The chemical formula of nitride ion is $N^{3-}$. It has -3 charge on it, thus its valency is 3.
[1 Mark]

(b) The chemical formula of ammonium ion is ${NH}_4^{+}$. It has +1 charge on it, thus its valency is 1.
[1 Mark]

(c) The chemical formula of hydrogen carbonate ion is ${HCO}_3^{-}$. It has -1 charge on it, thus its valency is 1.
[1 Mark]