Polyatomic Ions
| 1. | acetate | C₂H₃O₂⁻ | |
| 2. | ammonium | NH4⁺ | |
| 3. | arsenate | AsO₃³⁻ | |
| 4. | borate | BO₃³⁻ | |
| 5. | bromate | BrO₃⁻ | |
| 6. | bromite | BrO₂⁻ | |
| 7. | carbonate | CO₃²⁻ | |
| 8. | chlorate | ClO₃⁻ | |
| 9. | chlorite | ClO₂⁻ | |
| 10. | chromate | CrO₄²⁻ | |
| 11. | cyanide | CN⁻ | |
| 12. | dichromate | Cr₂O₇²⁻ | |
| 13. | dihydrogen phosphate | H₂PO₄⁻ | |
| 14. | hydrogen carbonate (bicarbonate) | HCO₃⁻ | |
| 15. | hydrogen phosphate (biphosphate) | HPO₄²⁻ | |
| 16. | hydrogen sulfate (Bisulfate) | HSO₄⁻ | |
| 17. | hydrogen sulfite (bisulfite) | HSO₃⁻ | |
| 18. | hydroxide | OH⁻ | |
| 19. | hypochlorite | HClO⁻ | |
| 20. | iodate | IO₃⁻ | |
| 21. | nitrate | NO₃⁻ | |
| 22. | nitrite | NO₂⁻ | |
| 23. | oxalate | C₂O₄²⁻ | |
| 24. | perchlorate | ClO₄⁻ | |
| 25. | permanganate | MnO₄⁻ | |
| 26. | peroxide | O₂²⁻ | |
| 27. | phosphate | PO₄³⁻ | |
| 28. | silicate | SiO₃²⁻ | |
| 29. | sulfate | SO₄²⁻ | |
| 30. | sulfite | SO₃²⁻ | |
| 31. | thiocyanate | SCN⁻ | |
| 32. | thiosulfate | S₂O₃²⁻ |