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Polyatomic Ions

  1. 1+
  2. ammonium - NH4+
  1. 2+
  2. mercury (I) - Hg22+
  3. mercury (II) - Hg2+


  1. 1-
  2. acetate - C2H3O2-
  3. bicarbonate (or hydrogen carbonate) - HCO3-
  4. bisulfate (or hydrogen sulfate) - HSO4-
  5. bromate - BrO3-
  6. bromite - BrO2-
  7. chlorate - ClO3-
  8. chlorite - ClO2-
  9. cyanate - OCN-
  10. cyanide - CN-
  11. dihydrogen phosphate - H2PO4-
  12. hydroxide - OH-
  13. hypobromite - BrO-
  14. hypochlorite - ClO-
  15. hypoiodite - IO-
  16. iodate - IO3-
  17. iodite - IO2-
  18. nitrate - NO3-
  19. nitrite - NO2-
  20. perbromate - BrO4-
  21. perchlorate - ClO4-
  22. periodate - IO4-
  23. permanganate - MnO4-
  24. thiocyanate - SCN-
  1. 2-
  2. carbonate - CO32-
  3. chromate - CrO42-
  4. dichromate - Cr2O72-
  5. hydrogen phosphate - HPO42-
  6. oxalate - C2O42-
  7. peroxide - O22-
  8. selenate - SeO42-
  9. sulfate - SO42-
  10. sulfite - SO32-
  11. thiosulfate - S2O32-
  1. 3-
  2. arsenate - AsO43-
  3. borate - BO33-
  4. phosphate - PO43-