""" Common Polyatomic Ions 1. Ammonium: NH4+ 2. Hydronium: H3O+ Anions: 1. Acetate: C2H3O2- or CH3COO- 2. Carbonate: CO3^2- 3. Bicarbonate (Hydrogen carbonate): HCO3- 4. Sulfate: SO4^2- 5. Hydrogen sulfate (Bisulfate): HSO4- 6. Sulfite: SO3^2- 7. Hydrogen sulfite (Bisulfite): HSO3- 8. Phosphate: PO4^3- 9. Hydrogen phosphate: HPO4^2- 10. Dihydrogen phosphate: H2PO4- 11. Nitrate: NO3- 12. Nitrite: NO2- 13. Chlorate: ClO3- 14. Chlorite: ClO2- 15. Hypochlorite: ClO- 16. Perchlorate: ClO4- 17. Chromate: CrO4^2- 18. Dichromate: Cr2O7^2- 19. Permanganate: MnO4- 20. Cyanide: CN- 21. Thiocyanate: SCN- 22. Hydroxide: OH- 23. Oxalate: C2O4^2- 24. Peroxide: O2^2- 25. Thiosulfate: S2O3^2- 26. Arsenate: AsO4^3- 27. Arsenite: AsO3^3- 28. Borate: BO3^3- 29. Silicate: SiO3^2- 30. Selenate: SeO4^2- 31. Tartrate: C4H4O6^2- 32. Phosphite: PO3^3- """