Polytomic ion

Bromate

Bromate

BrO 3 (-1)

Perchlorate

CIO 4 (-1)

Chlorate

CIO 3 (-1)

Chlorite

CIO 2 (-1)

Hypochlorite

ClO -1

Iodate

IO 3 (-1)

Iodite

IO 2 (-1)

Nitrate

NO 3(-1)

Nitrite

NO 2(-1)

Hydroxide

OH (-1)

Cyanide

CN (-1)

Thiocyanate

SCN (-1)

Acetate

C2H3O2 (-1)

Permanganate

MnO 4 (-1)

Carbonate

CO 3 (-2)

Sulfate

SO 4 (-2)

Sulfite

SO 3 (-2)

Chromate

CrO 4 (2-)

Dichromate

CrO4 (-2)

Oxalate

C2O4 (-2)

Peroxide

O2 (-2)

Phosphate

PO 4 (-3)

Phosphite

PO3 (-3)

Arsenate

AsO 4 (-3)

Ammonium

NH 4 (+1)