Question

(i) Name three elements each whose ions have valency +1,+2 and +3 respectively.
(ii) Name three non-metals/radicals which have valency -1,-2 and -3.

Answer 1

i. $\text{+1 = Hydrogen, Sodium, Potassium.}$

$\text{+2 = Calcium, Magnesium, Zinc.}$

$\text{+3 = Aluminium, Chromium, Ferric [Fe(III)]}$

ii. $\text{-1 =Chlorine, Bromine, Iodine.}$

$\text{-2 = Oxide, Sulphide, Sulphate.}$

$\text{-3 = Nitrogen, Nitride Phosphate.}$