8.6 Write formulas for the following compounds:

(a) Mercury(II) chloride

(b) Nickel(II) sulphate

(c) Tin(IV) oxide

(d) Thallium(I) sulphate

(e) Iron(III) sulphate

(f) Chromium(III) oxide

(a) Mercury (II) chloride: HgCl2 (b) Nickel (II) sulphate: NiSO4 (c) Tin (IV) oxide: SnO2 (d) Thallium (I) sulphate: Tl2SO4 (e) Iron (III) sulphate: Fe2SO43  

(f) Chromium (III) oxide: Cr2O3