Common Polyatomic Ions

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Hg₂²⁺

Mercury (I)

NH₄⁺

ammonium

H₃O⁺

Hydronium

H₂PO₃^-

Dihydrogen phosphite

H₂PO₄^-

Dihydrogen phosphate

HCO₃^-

Hydrogen Carbonate OR Bicarbonate

HSO₃^-

Hydrogen sulfite

HSO₄^-

Hydrogen Sulfate

NO₂^-

Nitrite

NO₃^-

Nitrate

OH^-

Hydroxide

CH₃COO^-  (Or it can also be known as: CH₃CO₂ or C₂H₃O₂^-)

*Positive ions are added at the end of this polyatomic ion to better reflect were the true molecule is. 

Acetate

CrO₂^-

Chromite

CN^-

cyanide

CNO^-

cyanate

CNS^-

thiocyanate

O₂^-

superoxide

MnO₄^-

permanganate

ClO^-

hypochlorite

ClO₂^-

chlorite

ClO₃^-

chlorate

ClO₄^-

perchlorate

BrO^-

hypobromite

BrO₂^-

bromite

BrO₃^-

bromate

BrO₄^-

perbromate

IO^-

hypoiodite

IO₂^-

Iodite

IO₃^-

iodate

IO₄^-

periodate

HPO₃^2-

hydrogen phosphite

HPO₄^2-

hydrogen phosphate

CO₃^2-

carbonate

SO₃^2-

sulfite

SO₄^2-

sulfate

S₂O₃^2-

thiosulfate

SiO₃^2-

silicate

C₂^2-

carbide

C₂O₄^2-

oxalate

CrO₄^2-

chromate

Cr₂O₇^2-

dichromate

C₄H₄O₆^2-

tartrate

MoO₄^2-

molybdate

O₂^2-

peroxide

S₂^2-

disulfide

PO₃^3-

Phosphite

PO₄^3-

phosphate

AsO₃^3-

Arsenite

AsO₄^3-

Arsenate