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polyatomic ions
| name | formula |
|---|---|
| Sulfate | SO₄⁻² |
| Nitrate | NO₃⁻ |
| Nitrite | NO₂⁻ |
| Phosphate | PO₄⁻³ |
| Acetate | C₂H₃O₂⁻ |
| Hydroxide | OH⁻ |
| Peroxide | O₂⁻² |
| Permanganate | MnO₄ ⁻ |
| Cyanide | CN⁻ |
| Hydrogen Carbonate | HCO₃⁻ |
| Carbonate | CO₃⁻² |
| Ammonium | NH₄⁺ |
| Perchlorate | ClO₄⁻ |
| Chlorate | ClO₃⁻ |