Polyatomic Ions

Ammonium

NH4 1+

Hydronium

H3O 1+

Mercury(I)

Hg2 2+

Dihydrogen Phosphite

H2PO3 1-

Dihydrogen Phosphate

H2PO4 1-

Hydrogen Carbonate

HCO3 1-

Hydrogen Sulfite

HSO3 1-

Hydrogen Sulfate

HSO4 1-

Nitrite

NO2 1-

Nitrate

NO3 1-

Hydroxide

OH 1-

Acetate

CH3COO 1-

Chromite

CrO2 1-

Cyanide

CN 1-

Cyanate

CNO 1-

Thiocyanate

CNS 1-

Superoxide

O2 1-

Permanganate

MnO4 1-

Hypochlorite

ClO 1-

Chlorite

ClO2 1-

Chlorate

ClO3 1-

Perchlorate

ClO4 1-

Hypobromite

BrO 1-

Bromite

BrO2 1-

Bromate

BrO3 1-

Perbromate

BrO4 1-

Hypoiodite

IO 1-

Iodite

IO2 1-

Iodate

IO3 1-

Periodate

IO4 1-

Aluminate

AlO2 1-

Azide

N3 1-

Hydrogen Phosphite

HPO3 2-

Hydrogen Phosphate

HPO4 2-

Carbonate

CO3 2-

Sulfite

SO3 2-

Sulfate

SO4 2-

Thiosulfate

S2O3 2-

Silicate

SiO3 2-

Carbide

C2 2-

Oxalate

C2O4 2-

Chromate

CrO4 2-

Dichromate

Cr2O7 2-

Tartrate

C4H4O6 2-

Molybdate

MoO4 2-

Peroxide

O2 2-

Disulfide

S2 2-

Phosphite

PO3 3-

Phosphate

PO4 3-

Hypophosphite

PO2 3-

Arsenite

AsO3 3-

Arsenate

AsO4 3-

Pyrophosphate

P2O7 4-