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polyatomic ions
| Term | Definition |
|---|---|
| ammonium | NH4+ |
| nitrite | NO2- |
| nitrate | NO3- |
| hydroxide | OH- |
| cyanide | CN- |
| hypochlorite | ClO- |
| chlorite | ClO2- |
| chlorate | ClO3- |
| perchlorate | ClO4 |
| acetate | C2H3O2- |
| carbonate | CO32- |
| sulfite | SO32- |
| sulfate | SO42- |
| peroxide | O22- |
| phosphate | PO43- |