Common Polyatomic Ions and Their Formulas in Chemistry
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40 Terms
Acetate
C₂H₃O₂⁻ (or CH₃COO⁻)
Arsenate
AsO₄³⁻
Arsenite
AsO₃³⁻
Benzoate
C₆H₅COO⁻
Borate
BO₃³⁻
Bromate
BrO₃⁻
Carbonate
CO₃²⁻
Hydrogen carbonate (bicarbonate)
HCO₃⁻
Chlorate
ClO₃⁻
Chloride
Cl⁻
Chlorite
ClO₂⁻
Hypochlorite
ClO⁻
Perchlorate
ClO₄⁻
Chromate
CrO₄²⁻
Dichromate
Cr₂O₇²⁻
Cyanide
CN⁻
Cyanate
CNO⁻
Dihydrogen phosphate
H₂PO₄⁻
Hydrogen phosphate (monohydrogen phosphate)
HPO₄²⁻
Phosphate
PO₄³⁻
Pyrophosphate
P₂O₇⁴⁻
Hydrogen sulfate (bisulfate)
HSO₄⁻
Sulfate
SO₄²⁻
Hydrogen sulfite (bisulfite)
HSO₃⁻
Hydrogen sulfide
HS⁻
Hydroxide
OH⁻
Iodate
IO₃⁻
Periodate
IO₄⁻
Nitrate
NO₃⁻
Nitrite
NO₂⁻
Orthosilicate
SiO₄⁴⁻
Oxalate
C₂O₄²⁻
Hydrogen oxalate (binoxalate)
HC₂O₄⁻
Permanganate
MnO₄⁻
Peroxide
O₂²⁻
Thiocyanate
SCN⁻
Thiosulfate
S₂O₃²⁻
Ammonium
NH₄⁺
Hydronium
H₃O⁺
Sulfite
SO₃²⁻
Note 
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