AP Chemistry - Polyatomic Ions

Memorize the 56 polyatomic ions relevant for the AP Chem exam

NH₄⁺

Ammonium

H₃O⁺

Hydronium

Hg₂²⁺

Mercury (I)

ClO^-

Hypochlorite

ClO₂^-

Chlorite

ClO₃^-

Chlorate

ClO₄^-

Perchlorate

BrO^-

Hypobromite

BrO₂^-

Bromite

BrO₃^-

Bromate

BrO₄^-

Perbromate

IO^-

Hypoiodite

IO₂^-

Iodite

IO₃^-

Iodate

IO₄^-

Periodate

CN^-

Cyanide

OCN^-

Cyanate

SCN^-

Thiocyanate

HCO₃^-

Hydrogen Carbonate (Bicarbonate)

HS^-

Hydrogen Sulfide (Bisulfide)

HSO₃^-

Hydrogen Sulfite (Bisulfite)

HSO₄^-

Hydrogen Sulfate (Bisulfate)

H₂PO₃^-

Dihydrogen Phosphite

H₂PO₄^-

Dihydrogen Phosphate

NO₂^-

Nitrite

NO₃^-

Nitrate

C₂H₃O₂^-

Acetate

C₇H₅O₂^-

Benzoate

AlO₂^-

Aluminate

OH^-

Hydroxide

O₂^-

Superoxide

MnO₄^-

Permanganate

CrO₂^-

Chromite

N₃^-

Azide

CO₃^2-

Carbonate

C₂O₄^2-

Oxalate

C₄H₄O₆^2-

Tartrate

CrO₄^2-

Chromate

Cr₂O₇^2-

Dichromate

HPO₃^2-

Hydrogen Phosphite

HPO₄^2-

Hydrogen Phosphate

MnO₄^2-

Manganate

MoO₄^2-

Molybdate

O₂^2-

Peroxide

SiO₃^2-

Silicate

S₂^2-

Disulfide

SO₃^2-

Sulfite

SO₄^2-

Sulfate

S₂O₃^2-

Thiosulfate

AsO₃^3-

Arsenite

AsO₄^3-

Arsenate

BO₃^3-

Borate

PO₂^3-

Hypophosphite

PO₃^3-

Phosphite

PO₄^3-

Phosphate

P₂O₇^4-

Pyrophosphate