Common Polyatomic Ions

Ammonium
NH4+
Acetate
C2H3O2-
Amide
NH2-
Azide
N3-
Hydrazide
N2H3-
Benzoate
C7H5O2-
Bitartate
HC4H4O6-
Bromate
BrO3-
Perchlorate
ClO4-
Chlorate
ClO3-
Chlorite
ClO2-
Hypochlorite
ClO-
Cyanate
OCN-
Cyanide
CN-
Hydrogen carbonate or Bicarbonate
HCO3-
Hydrogen sulfate or bisulfate
HSO4-
Hydrogen Sulfite or bislufite
HSO3-
Hydrosulfide or Bisulfide
HS-
Hydroxide
OH-
Iodate
IO3-
Triiodide
I3-
Nitrate
No3-
Nitrite
NO2-
Permanganate
MnO4-
Monobasic phosphate or
dihydrogen phosphate
H2PO4-
Thiocyanate
SCN-
Carbonate
CO3 2-
Chromate
CrO4 2-
dichromate
Cr2O7 2-
Dibasic phosphate or Hydrogen phosphate
HPO4 2-
Peroxydisulfate
S2O8 2-
Pyrosulfate
S2O7 2-
Manganate
MnO3 2-
Oxalate
C2O4 2-
Peroxide
O2 2-
phthalate
C8H4O4 2-
metasilicate
SiO3 2-
Sulfate
SO4 2-
Sulfite
SO3 2-
Thiosulfate
S2O3 2-
Tartrate
C4H4O6 2-
Tetraborate
B4O7 2-
aluminate
AlO3 3-
Arsenate
AsO4 3-
Arsenite
AsO3 3-
Borate
BO3 3-
Citrate
C6H5O7 3-
Ferricyanide
Fe(CN)6 3-
Phosphate or tribasic phosphate
PO4 3-
Phosphite
PO3 3-
Ferrocyanide
Fe(CN)6 4-
silicate(ortho)
SiO4 4-
x

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