Chromium (II)

or

Chromous

Chromium (III)

or

Chromic

Iron(II)

or

Ferrous

Iron(III)

or

Ferric

Lead (II)

or

Plumbous

Manganese (II)

or

Manganous

Manganese (III)

or

Manganic

Mercury (I)

or

Mercurous

Mercury(II)

or

Mercuric

Tin (II)

or

Stannous

Tin(IV)

or

Stannic

Cobalt (III)

or

Cobaltic

Cobalt (II)

or

Cobaltous

Copper (II)

or

Cupric

Copper (I)

or

Cuprous

Mercury (I)

or 

Mercurous

Nickel(II)

or 

Nickelous

Lead(IV)

or

plumbic