Common Polyatomic Ions

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NH₄⁺¹

ammonium

Hg₂⁺²

mercury (I)

PO₄⁻³

phosphate

PO₃⁻³

phosphite

SO₄⁻²

sulfate

SO₃⁻²

sulfite

CO₃⁻²

carbonate

C₂O₄⁻²

oxalate

CrO₄⁻²

chromate

Cr₂O₇⁻²

dichromate

HPO₄⁻²

hydrogen phosphate

NO₃⁻¹

nitrate

NO₂⁻¹

nitrite

ClO₄⁻¹

perchlorate

ClO₃⁻¹

chlorate

ClO₂⁻¹

chlorite

ClO⁻¹

hypochlorite

C₂H₃O₂⁻¹

acetate

MnO₄⁻¹

permanganate

HSO₄⁻¹

hydrogen sulfate

HCO₃⁻¹

hydrogen carbonate

H₂PO₄⁻¹

dihydrogen phosphate

CN⁻¹

cyanide

OH⁻¹

hydroxide

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