English

Noun

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

• hydronium
• hydroxide
• hydroxyl
• pOH
• pH