polyatomic ions <3

acetate

C2 H3 O2 ^ -

carbonate

C O3 ^ 2-

hydrogen carbonate

H C O3 ^ -

hydroxide

O H ^ -

nitrate

N O3 ^ -

nitrite

N O2 ^ -

chromate

Cr O4 ^2-

dichromate

Cr2 O7 ^2-

phosphate

P O4 ^3-

hydrogen phosphate

H P O4 ^2-

ammonium

N H4 ^ +

hypochlorite

Cl O ^ -

chlorite

Cl O2 ^ -

chlorate

Cl O3 ^ -

perchlorate

Cl O4 ^ -

permanganate

Mn O4 ^ -

sulfate

S O4 ^2-

sulfite

S O3 ^2-

hydrogen sulfite

H S O3 ^ -

hydrogen sulfate

H S O4 ^ -

peroxide

O2 ^2-

cyanide

C N ^ -