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Polyatomic ions
| Question | Answer |
|---|---|
| acetate | C₂H₃O₂⁻ |
| carbonate | CO₃²⁻ |
| chlorate | ClO₃⁻ |
| chlorite | ClO₂⁻ |
| cyanide | CN⁻ |
| hydrogen carbonate or bicarbonate | HCO₃⁻ |
| hydrogen sulfate or bisulfate | HSO₄⁻ |
| hydrogen sulfite or bisulfite | HSO₃⁻ |
| hydroxide | OH⁻ |
| hypochlorite | ClO⁻ |
| nitrate | NO₃⁻ |
| nitrite | NO₂⁻ |
| phosphate | PO₄³⁻ |
| phosphite⁻ | PO₃³⁻ |
| sulfate | SO₄²⁻ |
| sulfite | SO₃²⁻ |
| chromate | CrO₄²⁻ |
| dichromate | Cr₂O₇²⁻ |
| permanganate | MnO₄⁻ |
| borate | BO₃³⁻ |
| oxalate | C₂O₄²⁻ |
| silicate | SiO₃²⁻ |
| perchlorate | ClO₄⁻ |
| perbromate | BrO₄⁻ |
| bromate | BrO₃⁻ |
| bromite | BrO₂⁻ |
| hypobromite | BrO⁻ |
| periodate | IO₄⁻ |
| iodate | IO₃⁻ |
| hypoiodite | IO⁻ |
| hydronium | H₃O⁺ |
| ammonium | NH₄⁺ |
| peroxide | O₂²⁻ |
| hydrogen phosphate or biphosphate | HPO₄²⁻ |
| dihydrogen phosphate | H₂PO₄⁻ |
| hydrogen phosphite or biphosphite | HPO₃²⁻ |
| dihydrogen phosphite | H₂PO₃⁻ |
| hydrogen oxalate or bioxalate | HC₂O₄⁻ |
| arsenate | AsO₄³⁻ |
| mercury(I) | Hg₂²⁺ |
| selenate | SeO₄²⁻ |
| selenite | SeO₃²⁻ |
| formate | HCO₂⁻ |
| thiocyanate | SCN⁻ |
| azide | N₃⁻ |
| thiosulfate | S₂O₃²⁻ |