Polyatomic Ions (Anions)

This is all of the polyatmomic anions that AP Chemistry students must know/memmorize for the AP Chemistry Exam.

Acetate

C₂H₃O₂¹⁻

Bisulfide

HS¹⁻

Bromide

Br¹⁻

Bromate

BrO₃¹⁻

Chloride

Cl¹⁻

Hypochlorite

ClO¹⁻

Chlorite

ClO₂¹⁻

Chlorate

ClO₃¹⁻

Perchlorate

ClO₄¹⁻

Permanganate

MnO₄¹⁻

Cyanide

CN¹⁻

Cyanate

CNO¹⁻

Thiocyanate

SCN¹⁻

Hydride

H¹⁻

Hydroxide

OH¹⁻

Nitrite

NO₂¹⁻

Nitrate

NO₃¹⁻

Iodide

I¹⁻

Iodate

IO₃¹⁻

Hydrogen Carbonate

HCO₃¹⁻

Dihydrogen Phosphite

H₂PO₃¹⁻

Dihydrogen Phosphate

H₂PO₄¹⁻

Hydrogen Sulfite

HSO₃¹⁻

Hydrogen Sulfate

HSO₄¹⁻

Oxide

O²^-

Peroxide

O₂²⁻

Oxalate

C₂O₄²⁻

Carbonate

CO₃²⁻

Chromate

CrO₄²⁻

Dichromate

Cr₂O₇²⁻

Silicate

SiO₃²⁻

Sulfite

SO₃²⁻

Sulfate

SO₄²⁻

Thiosulfate

S₂O₃²⁻

Hydrogen Phosphite

HPO₃²⁻

Hydrogen Phosphate

HPO₄²⁻

Phosphide

P³⁻

Phosphite

PO₃³⁻

Phosphate

PO₄³⁻

Arsenate

AsO₄³⁻