A hydrogen atom that has gained or lost an electron
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A hydrogen ion is created when a hydrogen atom loses an electron. A positively charged hydrogen ion (or proton) can readily combine with other particles and therefore is only seen isolated when it is in a gaseous state or a nearly particle-free space.[1] Due to its extremely high charge density of approximately 2×1010 times that of a sodium ion, the bare hydrogen ion cannot exist freely in solution as it readily hydrates, i.e., bonds quickly.[2] The hydrogen ion is recommended by IUPAC as a general term for all ions of hydrogen and its isotopes.[3]
Depending on the charge of the ion, two different classes can be distinguished: positively charged ions and negatively charged ions.
^"Hydrogen ion - chemistry". britannica.com. Retrieved 18 March 2018.
^due to its extremely high charge density of approximately 2×1010 times that of a sodium ion
^Compendium of Chemical Terminology, 2nd edition McNaught, A.D. and Wilkinson, A. Blackwell Science, 1997 ISBN 0-86542-684-8, also online Archived 2005-12-12 at the Wayback Machine
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