Polyatomic Ions 

  1. Ammonium = (NH4)+1
  2. Acetate = (CH3COO)-1 or (C2H3O)-1
  3. Bromate = (BrO3)1-
  4. Carbonate = (CO3)2-
  5. Chlorate = (CIO3)1-
  6. Chlorite = (CIO2)1-
  7. Chromate = (CrO4)2-
  8. Cyanide = (CN)-
  9. Dichromate = (CrO7)2-
    1. Hydrogen carbonate = (HCO3)1-
    2. Bicarbonate = (HCO3)1-
    3. Hydrogen sulfate = (HSO4)1-
    4. Bisulfate = (HSO4)1-
    5. Hydroxide = (OH)1-
    6. Hypochlorite = (CIO)1-
    7. Iodate = (IO3)-
    8. Nitrate = (NO3)1-
    9. Nitrite = (NO2)1-
    10. Oxalate = (C2O4)2-
    11. Perchlorate = (CIO4)-
    12. Periodate = (IO4)1-
    13. Permanganate = (MnO4)1-
    14. Peroxide = (O2)2-
    15. Phosphate = (PO4)3-
    16. Phosphite = (PO3)3-
    17. Silicate = (Sio4)4-
    18. Sulfate = (SO4)2-
    19. Sulfite = (SO3)2-
    20. Thiocyanate = (SCN)1-
    21. Thiosulfate = (S2O3)2-