Hydrogen-ion meaning

The positively charged ion of hydrogen, H+ , formed by removal of the electron from atomic hydrogen and found in the form of hydronium ion in all aqueous solutions of acids.
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The positively charged nucleus of hydrogen, H+, without its electron.
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(chemistry) Used other than as an idiom: see hydrogen,‎ ion. ; H- or H+
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(chemistry) A proton combined with one or more water molecules; usually written H3O+ and called the hydronium ion though is best considered as H9O4+ but is often written H+(aq) for simplicity.
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(chemistry) A bare hydrogen nucleus; a proton , deuteron or triton.
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