State which of the following ions or radicals given below of non-metallic elements exhibit valency: 1^-, 2^- & 3^-

(a) Chloride

(b) Bromide

(c) Iodide

(d) Nitrate

(e) Hydroxide

(f) Bicarbonate

(g) Bisulphite

(h) Bisulphate

(i) Aluminate

(j) Permanganate

(k) Oxide

(l) Sulphide

(m) Sulphite

(n) Sulphate

(o) Carbonate

(p) Dichromate

(q) Zincate

(r) Plumbite

(s) Phosphate

(t) Nitride

[write each ion or radical with the correct valency]

Differentiate between the terms - 'Ion' & 'radical' with suitable examples.

Write the chemical formula of Sodium bromide in a step-by-step manner.

Write the chemical formula of Potassium nitrate in a step-by-step manner.