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<p>A <b>hydrogen ion</b> is an <a href="page.php?w=ion">ion</a> created when a <a href="page.php?w=hydrogen">hydrogen</a> atom loses or gains an <a href="page.php?w=electron">electron</a>. A positively charged hydrogen ion (or <a href="page.php?w=proton">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="page.php?w=charge_density">charge density</a> of approximately  times that of a sodium ion, the bare hydrogen</p><p>
<a accesskey="3" href="page.php?w=hydrogen_ion&amp;p=2">3.Next</a>
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