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hydrogen ion
A hydrogen atom that has lost or gained an electron, and in consequence has a charge. The positive hydrogen ion (H+), having lost its only electron, consists of just a proton.
Chemically free hydrogen ions are rarely form and dissociation to H+ occurs only when the resultant ion can be complexed. Thus hydrogen chloride (HCl) gas is undissociated but gives [H(H2O)n]+Cl- and [NH4]+Cl- with water or ammonia.
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