hydrogen ion

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hydrogen ion ‎(plural hydrogen ions)

  1. (chemistry) Used other than as an idiom: see hydrogen,‎ ion. ; H- or H+
  2. (chemistry) a proton combined with one or more water molecules; usually written H3O+ and called the hydronium ion though is best considered as H9O4+ but is often written H+(aq) for simplicity
  3. (chemistry) a bare hydrogen nucleus; a proton , deuteron or triton

See also[edit]