Chem: polyatomic ions

NH4+

NH4+

Ammonium

NO2-

Nitrite

NO3-

Nitrate

SO3 2-

Sulfite

SO4 2-

Sulfate

HSO4-

hydrogen sulfate (bisulfate)

OH-

Hydroxide

CN-

Cyanide

PO4 3-

Phosphate

HPO4 2-

hydrogen phosphate

H2PO4 2-

dihydrogen phosphate

CO3 2-

Carbonate

HCO3 -

hydrogen carbonate (bicarbonate)

CIO-

Hypochlorite

CIO2 -

Chlorite

CIO3 -

Chlorate

CIO4 -

Perchlorate

C2H3O2-

Acetate

MnO4-

Permanganate

Cr2O7 2-

Dichromate

CrO4 2-

Chromate

O2 2-

Peroxide

BrO3-

Bromate

IO3-

Iodate

ClO4-

Perchlorate

SeO4 2-

Selenate

AsO4 3-

Arsenate