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