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Polyatomic Ions
| formula | name |
|---|---|
| NH4 + | ammonium |
| OH - | hydroxide |
| CN - | cyanide |
| C2H3O2 - | acetate |
| NO3 - | nitrate |
| CO3 2- | carbonate |
| SO4 2- | sulfate |
| PO4 3- | phosphate |
| ClO4 - | perchlorate |
| ClO3 - | chlorate |
| ClO2 - | chlorite |
| ClO - | hypochlorite |
| HCO3 - | bicarbonate or hydrogen carbonate |
| HSO4 - | bisulfate or hydrogen sulfate |
| HPO4 2- | hydrogen phosphate |
| H2PO4 - | dihydrogen phosphate |
| CrO4 2- | chromate |
| Cr2O7 2- | dichromate |
| C2O4 2- | oxalate |
| NO2 - | nitrite |
| CO2 2- | carbonite |
| SO3 2- | sulfite |
| BrO4 - | perbromate |
| BrO3 - | bromate |
| BrO2 - | bromite |
| BrO - | hypobromite |
| PO3 3- | phosphite |