Common Polyatomic Ions

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Acetate

C₂H₃O₂⁻

Ammonium

NH₄⁺

Bromate

BrO₃⁻

Carbonate

CO₃²⁻

Chlorate

ClO₃⁻

Chlorite

ClO₂⁻

Chromate

CrO₄²⁻

Cyanide

CN⁻

Dichromate

Cr₂O₇²⁻

Hydrogen Carbonate (Bicarbonate)

HCO₃⁻

Hydrogen Phosphate

HPO₄²⁻

Hydrogen Sulfate (Bisulfate)

HSO₄⁻

Hydroxide

OH⁻

Hypochlorite

ClO⁻

Iodate

IO₃⁻

Mercury (I) ion

Hg₂²⁺

Nitrate

NO₃⁻

Nitrite

NO₂⁻

Oxalate

C₂O₄²⁻

Perchlorate

ClO₄⁻

Permanganate

MnO₄⁻

Peroxide

O₂²⁻

Phosphate

PO₄³⁻

Sulfate

SO₄²⁻

Sulfite

SO₃²⁻

Thiocyanate

SCN⁻

Thiosulfate

S₂O₃²⁻

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