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polyatomic ions
| Term | Definition |
|---|---|
| acetate | C2H3O2- |
| carbonate | CO3^2- |
| hydrogen carbonate | HCO3- |
| hydroxide | OH- |
| nitrite | NO2- |
| nitrate | NO3- |
| chromate | CrO4^2- |
| dichromate | Cr2O7^2- |
| phosphate | PO4-^3- |
| hydrogen phosphate | HIPO4^2- |
| dihydrogen phosphate | H2PO4- |
| ammonium | NH4+ |
| hypochlorite | CIO- |
| chlorite | CIO2 |
| chlorate | CIO3- |
| perchlorate | CIO4- |
| permanganate | MnO4- |
| sulfite | SO4^2- |
| hydrogen sulfate | HSO4- |
| cyanide | CN- |
| peroxide | O2^2- |