Polyatomic ions

NH₄⁺ Ammonium

H₃O+ Hydronium

NO₃⁻ Nitrate

NO₂⁻ Nitrite

CO₃²⁻ Carbonate

HCO₃⁻ Hydrogen Carbonate (bicarbonate)

C₂H₃O₂⁻ Acetate

C₂O₄²⁻ Oxalate

CN⁻ Cyanide

SCN⁻ Thiocyanate

SO₄²⁻ Sulfate

HSO₄⁻ Hydrogen Sulfate

SO₃²⁻ Sulfite

HSO₃⁻ Hydrogen Sulfite

S₂O₃²⁻ Thiosulfate

PO₄³⁻ Phosphate

HPO₄²⁻ Hydrogen Phosphate

H₂PO₄⁻ Dihydrogen Phosphate

PO₃³⁻ Phosphate

ClO₄⁻ Perchlorate

ClO₃⁻ Chlorate

ClO₂⁻ Chlorite

ClO⁻ Hypochlorite

MnO₄⁻ Permanganate

CrO²⁻ Chromate

Cr₂O₇²⁻ Dichromate

OH⁻ Hydroxide

O₂²⁻ Peroxide

BrO₃⁻ Bromate