Polyatomic ions

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Ammonium

N H4 +1

Acetate

C2 H3 O2 1-

Bicarbonate or hydrogen carbonate

H C O3 1-

Perchlorate

Cl O4 1-

Chlorate

Cl O3 1-

Chlorite

Cl O2 1-

Hypochlorite

Cl O 1-

Cyanide

C N 1-

Hydroxide

O H 1-

Nitrate

N O3 1-

Nitrite

N O2 1-

Permanganate

Mn O4 1-

Carbonate

C O3 2-

Chromate

Cr O4 2-

Dichromate

Cr2 O7 2-

Sulfate

S O4 2-

Sulfite

S O3 2-

Phosphate

P O4 3-

Phosphite

P O3 3-