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polyatomic Ions
| Term | Definition |
|---|---|
| Acetate | C2H3O2- |
| Carbonate | CO32- |
| hydrogen carbonate | HCO3- |
| Hydroxide | OH- |
| Nitrite | NO2- |
| Nitrate | NO3- |
| Chromate | CrO4 2- |
| Dichromate | Cr2O7 2- |
| Phosphate | PO4 3- |
| Hydrogen phosphate | HPO4 2- |
| Dihydrogen phosphate | H2PO4- |
| Ammonium | NH4+ |