AP Chemistry Polyatomic Ions

These are the Polyatomic Ions and their corresponding charges that you will need to memorize for the AP Chemistry curriculum.

Ammonium

Ammonium

NH4⁺

Hydronium

H₃O⁺

Mercury I

Hg₂²⁺

Dihydrogen Phosphate

H₂PO₄⁻

Hydrogen Carbonate

HCO₃⁻

Hydrogen Sulfite

HSO₃⁻

Hydrogen Sulfate

HSO₄⁻

Nitrite

NO₂⁻

Nitrate

NO₃⁻

Hydroxide

OH⁻

Acetate

CH₃COO^-

Cyanide

CN⁻

Cyanate

CNO^-

Thiocyanate

CNS^-

Superoxide

O₂^-

Permanganate

MnO₄^-

Hypochlorite

ClO^-

Chlorite

ClO₂^-

Chlorate

ClO₃^-

Perchlorate

ClO₄^-

Bromate

BrO₃^-

Iodate

IO₃^-

Hydrogen Phosphate

HPO₄^2-

Carbonate

CO₃^2-

Sulfite

SO₃^2-

Sulfate

SO₄^2-

Thiosulfate

S₂O₃^2-

Silicate

SiO₃^2-

Oxalate

C₂O₄^2-

Chromate

CrO₄^2-

Dichromate

Cr₂O₇^2-

Molybdate

MoO₄^2-

Peroxide

O₂^2-

Phosphate

PO₄^3-

Arsenate

AsO₄^3-

Phosphite

PO₃^3-