• Anion is negative ions that are formed when a nonmetal atom gains one or more electrons.
  • Anions are so named because they are attracted to the anode (positive field) in an electric field.
  • Iodide ion is widely used in water supplies to help prevent tooth decay.
  • Chloride is an important component in ion balance in blood and is needed by the thyroid gland to make the hormone thyroxine.
  • The charge on the anion is indicated by a superscript following the symbol.
  • Common anions are listed in the Table below.
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