Write formulas for the following compounds.

a$.$ ferrous sulfide

b$.$ iron$($III$)$ hydroxide

c$.$ iron$($II$)$ chloride

d$.$ ferric oxide

e$.$ aluminum iodide

f$.$ copper$($I$)$ chloride

g$.$ cupric cyanide tetrahydrate

h$.$ copper$($II$)$ oxide

i$.$ manganese$($IV$)$ oxide

j$.$ manganous chloride

k$.$ manganese$($VII$)$ oxide

nickel$($II$)$ iodide

m$.$ nickel$($III$)$ oxide

n$.$ chromium$($III$)$ oxide

o$.$ chromic oxide

p$.$ titanium$($IV$)$ chloride

q$.$ cobalt$($II$)$ chloride hexahydrate

r$.$ cobaltic chloride hexahydrate

s$.$ cobaltous oxide

t$.$ mercurous oxide

u$.$ mercury$($I$)$ chloride

v$.$ mercuric iodide