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Common Polyatomic Ions to Memorize

Ammonium

NH₄⁺

Mercury (I)

Hg₂²⁺

Hydronium

H₃O⁺

Hydrogen Carbonate

HCO₃⁻

Chlorate

ClO₃⁻

Chromate

CrO₄

Dihydrogen phosphate

H₂PO₄⁻

Hydrogen phosphate

HPO₄⁻

Hydrogen Sulfate

HSO₄⁻

Hydroxide

OH⁻

Nitrate

NO₃⁻

Nitrite

NO₂⁻

Permanganate

MnO₄⁻

Peroxide

O₂²⁻

Phosphate

PO₄⁻

Sulfate

SO₄²⁻

Sulfite

SO₃²⁻

Thiocyanate

SCN⁻

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