Polyatomic Ions

Arsenate

AsO4 -3 charge

Borate

BO3 -3 charge

Phosphate

PO4 -3 charge

Phosphite

PO3 -3 charge

Biphosphate

HPO4 -2 charge

Carbonate

CO3 -2 charge

Chromate

CrO4 -2 charge

Dichromate

Cr2O7 -2 charge

Oxalate

C2O4 -2 charge

Selenate

SeO4 -2 charge

Sulfate

SO4 -2 charge

Sulfite

SO3 -2 charge

Ammonium

NH4 +1 charge

Acetate

C2H3O2 or CH3COO -1 charge

Bicarbonate (hydrogen carbonate)

HCO3 -1 charge

Bromate

BrO3 -1 charge

Chlorate

ClO3 -1 charge

Chlorite

ClO2 -1 charge

Cyanide

CN -1 charge

Hydroxide

OH -1 charge

Hypochlorite

ClO -1 charge

Iodate

IO3 -1 charge

Nitrate

NO3 -1 charge

Nitrite

NO2 -1 charge

Perchlorate

ClO4 -1 charge

Permanganate

MnO4 -1 charge

Thiocyanate

CNS -1 charge