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Common Polyatomic Io
| Name | Formula | Charge |
|---|---|---|
| Sulfate | SO4 | -2 |
| Phosphate | PO4 | -3 |
| Ammonium | NH4 | +1 |
| Bicarbonate | HCO3 | -1 |
| Cyanide | CN | -1 |
| Hydroxide | OH | -1 |
| Nitrite | NO2 | -1 |
| Perchlorate | ClO4 | -1 |
| Permanganate | MnO4 | -1 |
| Carbonate | CO3 | -2 |
| Chromate | CrO4 | -2 |
| Thiosulfate | S2O3 | -2 |
| Sulfite | SO3 | -2 |
| Dichromate | Cr2O7 | -2 |
| Nitrate | NO3 | -1 |