polyatomic ions chem H

Citrate

C₆H₅O₇^3-

Cyanate

CNO^-

Perchlorate

ClO₄^-

Azide 

N₃^-

Cyanide 

CN^-

Permanganate

MnO₄^-

Acetate

CH₃COO^-

Dichromate

Cr₂O₇^2-

Peroxide

O₂^2-

Arsenate

AsO₄^3-

Hydrogen carbonate or bicarbonate

HCO₃^-

Hydrogen sulfate

HSO₄^-

Borate

BO₃^3-

Hydroxide

OH^-

Phosphate

PO₄^3-

Bromate

BrO₃^-

Hypochlorite

ClO^-

Sulfate

SO₄^-2

Carbonate

CO₃^2-

Iodate

IO₃^-

Sulfite

SO₃^-2

Chlorate

ClO₃^-

Nitrate

NO₃^-

Thiocyanate

SCN^-

Chlorite

ClO₂^-

Nitrite

NO₂^-

Thiosulfate

S₂O₃^-2

Chromate

CrO₄^2-

Oxalate

C₂O₄^2-

Ammonium

NH₄⁺

Hydronium

H₃O⁺