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