hydrogen-ion

hydrogen ion

noun
ionized hydrogen of the form H + , found in aqueous solutions of all acids.

Origin:
1895–1900

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World English Dictionary
hydrogen ion
 
n
1.  an ionized hydrogen atom, occurring in plasmas and in aqueous solutions of acids, in which it is solvated by one or more water molecules; proton. Formula: H+
2.  an ionized hydrogen molecule; hydrogen molecular ion. Formula: H2+

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