#ion  an electrically charged particle; an atom that has lost one or more of its electrons
  supertype:  #atom  (physics and chemistry) the smallest component of an element having the chemical properties of the element
  subtype:  #anion  a negatively charged atom
     subtype:  #hydroxide_ion__hydroxideion__hydroxyl_ion  the anion OH having one oxygen and one hydrogen atom
     subtype:  #superoxide_anion__superoxide  the univalent anion O2-; "much of the O2 supporting cellular respiration is reduced to the superoxide anion O2-"
  subtype:  #cation  a positively charged atom
     subtype:  #hydrogen_ion  a positively charged atom of hydrogen; that is to say, a normal hydrogen atomic nucleus
     subtype:  #diazonium  the univalent cation R-N:N- (where R is an aromatic hydrocarbon); found in salts that are used in manufacturing azo dyes
  subtype:  #ammonium_ion__ammonium  the ion NH4 derived from ammonia; behaves in many respects like an alkali metal ion
  subtype:  #calcium_ion__calciumion__factor_IV  ion of calcium; a factor in the clotting of blood

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