Table E - Selected Polyatomic Ions

Hydronium

H₃O⁺

Mercury(I)

Hg₂²⁺

Ammonium

NH₄⁺

Acetate

C₂H₃O₂⁻ or CH₃COO⁻

Cyanide

CN⁻

Carbonate

CO₃²⁻

hydrogen carbonate

HCO₃⁻

Oxalate

C₂O₄²⁻

Hypochlorite

ClO⁻

Chlorite

ClO₂⁻

Chlorate

ClO₃⁻

Perchlorate

ClO₄⁻

Chromate

CrO₄²⁻

Dichromate

Cr₂O₇²⁻

Permanganate

MnO₄⁻

Nitrite

NO₂⁻

Nitrate

NO₃⁻

Peroxide

O₂²⁻

Hydroxide

OH⁻

Phosphate

PO₄³⁻

Thiocyanate

SCN⁻

Sulfite

SO₃²⁻

Sulfate

SO₄²⁻

Hydrogen Sulfate

HSO₄⁻

Thiosulfate

S₂O₃²⁻