#cation  a positively charged atom
  supertype:  ion  an electrically charged particle; an atom that has lost one or more of its electrons
  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

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