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Common Cations, Anions, and Polyatomic Anions

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  • Na+

    Sodium ion
  • K+

    Potassium ion
  • Ca2+

    Calcium ion
  • Mg2+

    Magnesium ion
  • Al3+

    Aluminum ion
  • Fe2+

    Iron(II) ion (ferrous)
  • Fe3+

    Iron(III) ion (ferric)
  • Cu+

    Copper(I) ion (cuprous)
  • Cu2+

    Copper(II) ion (cupric)
  • Zn2+

    Zinc ion
  • Ag+

    Silver ion
  • NH4+

    Ammonium ion
  • Cl-

    Chloride ion
  • Br-

    Bromide ion
  • I-

    Iodide ion
  • OH-

    Hydroxide ion
  • NO3-

    Nitrate ion
  • SO4 2-


    Sulfate ion
  • CO3 2-


    Carbonate ion
  • PO4 3-


    Phosphate ion
  • HCO 3-


    Bicarbonate (hydrogen carbonate) ion
  • CN-

    Cyanide ion
  • MnO 4-


    Permanganate ion
  • Cr2O7 2-


    Dichromate ion
  • C2H3O2-

    Acetate ion