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polyatomic ions
| Term | Definition |
|---|---|
| carbonate | CO3 2- |
| cyanide | CN - |
| hydroxide | OH - |
| nitrate | NO3 - |
| nitrite | NO2 - |
| sulfate | SO4 2- |
| sulfite | SO3 2- |
| phosphate | PO4 3- |
| phosphite | PO3 3- |
| perchlorate | ClO4 - |
| chlorate | ClO3 - |
| permanganate | MnO4 - |
| hydrogen carbonate (bicarbonate) | HCO3 - |
| dichromate | Cr2O7 2- |
| chromate | CrO4 2- |
| ammonium | NH4 + |
| acetate | C2H3O2 - |