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polyatomic ions
| Term | Definition |
|---|---|
| Ammonium | NH₄⁺ |
| Hydronium | H₃O⁺ |
| Acetate | C₂H₃O₂⁻ |
| Azide | N₃⁻ |
| Carbonate | CO₃²⁻ |
| Chlorate | ClO₃⁻ |
| Chlorite | ClO₂⁻ |
| Chromate | CrO₄²⁺ |
| Cyanide | CN⁻ |
| Dichromate | Cr₂O₇²⁺ |
| Dihydrogen phosphate | H₂PO₄⁻ |
| Hydrogen carbonate/Bicarbonate | HCO₃⁻ |
| Hydrogen Phosphate | HPO₄²⁻ |
| Hydrogen Sulfate/Bisulfate | HSO₄⁻ |
| Hydroxide | OH⁻ |
| Hypochlorite | ClO⁻ |
| Nitrate | NO₃⁻ |
| Nitrite | NO₂⁻ |
| Oxalate | C₂O₄²⁻ |
| Perchlorate | ClO₄⁻ |
| Permanganate | MnO₄⁻ |
| Peroxide | O₂²⁻ |
| Phosphate | PO₄³⁻ |
| Phosphite | PO₃³⁻ |
| Sulfate | SO₄²⁻ |
| Sulfite | SO₃²⁻ |
| Thiocyanite | SCN⁻ |