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Common Polyatomic Ions in General Chemistry

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  • Hydride ion

    Charge: 1−, Formula: \(\mathrm{H}^-\)
  • Acetate ion

    Charge: 1−, Formula: \(\mathrm{CH_3COO}^-\) or \(\mathrm{C_2H_3O_2}^-\)
  • Fluoride ion

    Charge: 1−, Formula: \(\mathrm{F}^-\)
  • Chlorate ion

    Charge: 1−, Formula: \(\mathrm{ClO_3}^-\)
  • Chloride ion

    Charge: 1−, Formula: \(\mathrm{Cl}^-\)
  • Perchlorate ion

    Charge: 1−, Formula: \(\mathrm{ClO_4}^-\)
  • Bromide ion

    Charge: 1−, Formula: \(\mathrm{Br}^-\)
  • Nitrate ion

    Charge: 1−, Formula: \(\mathrm{NO_3}^-\)
  • Iodide ion

    Charge: 1−, Formula: \(\mathrm{I}^-\)
  • Permanganate ion

    Charge: 1−, Formula: \(\mathrm{MnO_4}^-\)
  • Cyanide ion

    Charge: 1−, Formula: \(\mathrm{CN}^-\)
  • Hydroxide ion

    Charge: 1−, Formula: \(\mathrm{OH}^-\)
  • Oxide ion

    Charge: 2−, Formula: \(\mathrm{O}^{2-}\)
  • Carbonate ion

    Charge: 2−, Formula: \(\mathrm{CO_3}^{2-}\)
  • Peroxide ion

    Charge: 2−, Formula: \(\mathrm{O_2}^{2-}\)
  • Chromate ion

    Charge: 2−, Formula: \(\mathrm{CrO_4}^{2-}\)
  • Sulfide ion

    Charge: 2−, Formula: \(\mathrm{S}^{2-}\)
  • Dichromate ion

    Charge: 2−, Formula: \(\mathrm{Cr_2O_7}^{2-}\)
  • Sulfate ion

    Charge: 2−, Formula: \(\mathrm{SO_4}^{2-}\)
  • Nitride ion

    Charge: 3−, Formula: \(\mathrm{N}^{3-}\)
  • Phosphate ion

    Charge: 3−, Formula: \(\mathrm{PO_4}^{3-}\)