hydronium (plural hydroniums)
(inorganic chemistry) The hydrated hydrogen ion, H3O+.
May also be defined as the simplest of a class of oxygen cations with three bonds (i.e, the simplest form of oxonium).
• (hydrated hydrogen ion): hydronium ion
• (cation of oxygen): oxonium
• hydroxide
• hydrogen ion
Source: Wiktionary
7 June 2025
(noun) a unit of astronomical length based on the distance from Earth at which stellar parallax is 1 second of arc; equivalent to 3.262 light years
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