Hydrogen ion

<p>A hydrogen ion is created when a <a href="/facts/Hydrogen/BoYHjl0J">hydrogen</a> atom loses  an <a href="/facts/Electron/L0KBo5cW">electron</a>. A positively charged hydrogen ion (or <a href="/facts/Proton/clCjepXP">proton</a>) 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. Due to its extremely high <a href="/facts/Charge_density/xFDPXUDM">charge density</a> 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. The hydrogen ion is recommended by <a href="/facts/International_Union_of_Pure_and_Applied_Chemistry/2AV6myCK">IUPAC</a> as a general term for all <a href="/facts/Ion/3bePpDna">ions</a> of <a href="/facts/Hydrogen/BoYHjl0J">hydrogen</a> and its <a href="/facts/Isotope/KD9B1y6o">isotopes</a>. 
Depending on the <a href="/facts/Electric_charge/xxsBfmlB">charge</a> of the ion, two different classes can be distinguished: positively charged ions and negatively charged ions.
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Hydrogen ion open-in-new

Hydrogen ion