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polyatomic ions
| Term | Definition |
|---|---|
| Borate | BO₃³⁻ |
| Carbonate | CO₃²⁻ |
| Oxalate | C₂O₄²⁻ |
| Nitrate | NO₃⁻ |
| Nitrite | NO₂⁻ |
| Silicate | SiO₃²⁻ |
| Phosphate | PO₄³⁻ |
| Phosphite | PO₃³⁻ |
| Sulfate | SO₄²⁻ |
| Sulfite | SO₃²⁻ |
| Thiosulfate | S₂O₃²⁻ |
| Chlorate | ClO₃⁻ |
| Chlorite | ClO₂⁻ |
| Hypochlorite | ClO⁻ |
| Perchlorate | ClO₄⁻ |
| Chromate | CrO₄²⁻ |
| Dichromate | Cr₂O₇²⁻ |
| Manganate | MnO₄²⁻ |
| Permanganate | MnO₄⁻ |
| Arsenate | AsO₄³⁻ |
| Arsenite | AsO₃³⁻ |
| Bromate | BrO₃⁻ |
| Iodate | IO₃⁻ |
| Hydrogen carbonate | HCO₃⁻ |
| Hydrogen phosphate | HPO₄²⁻ |
| Hydrogen phosphite | HPO₃²⁻ |
| Dihydrogen phosphate | H₂PO₄⁻ |
| Dihydrogen phosphite | H₂PO₃⁻ |
| Hydrogen sulfate | HSO₄⁻ |
| Hydrogen sulfite | HSO₃⁻ |
| Hydrogen sulfide | HS⁻ |
| Ammonium | NH₄⁺ |
| Azide | N₃⁻ |
| Cyanide | CN⁻ |
| Thiocyanate | SCN⁻ |
| Acetate | C₂H₃O₂⁻ |
| Benzoate | C₇H₅O₂⁻ |
| Tartrate | C₄H₄O₆²⁻ |
| Hydroxide | OH⁻ |
| Peroxide | O₂²⁻ |