Polyatomic ions
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| Name | Formula |
|---|---|
| Sulfate | SO42- |
| Phosphate | PO43- |
| Chlorate | ClO3- |
| Nitrate | NO3- |
| Carbonate | CO32- |
| Ammonium | NH4+ |
| Dimercury | Hg22+ |
| Acetate | CH3COO- |
| Oxalate | C2O42- |
| Chromate | CrO42- |
| Dichromate | Cr2O72- |
| Permanganate | MnO4- |
| Hydroxide | OH- |
| Peroxide | O22- |
| Cyanide | CN- |
| Hydronium | H3O+ |