Common Polyatomic Ions

NH 4+

Ammonium

NO 2-

Nitrate

NO 3-

Nitrate

SO3 2-

Sulfite

SO4 2-

sulfate

HSO 4-

Hydrogen Sulfate

OH -

hydroxide

CN -

cyanide

PO4 3-

phosphate

HPO4 2-

hydrogen phosphate

H2PO 4-

dihydrogen phosphate

CO3 2-

carbonate

HCO 3-

hydrogen carbonate (bicarbonate)

ClO -

hypochlorite

ClO 2-

Chlorite

ClO 3-

Chlorite

ClO 4-

perchlorate

C2H3O2

acetate

MnO 4-

permaganate

Cr2O7 2-

dichromate

CrO4 2-

chromate

O2 2-

peroxide