hydrogen ion

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ion

 [i´on]
an atom or group of atoms having a positive (cation) or negative (anion) electric charge by virtue of having gained or lost an electron; substances forming ions are called electrolytes. adj., adj ion´ic.
dipolar ion an ion that has both positive and negative regions of charge.
hydrogen ion the positively charged hydrogen atom (H+), which is the positive ion of all acids. See also hydrogen ion concentration.
hydroxyl ion the negatively charged group, OH, present to excess in alkaline solutions.

hy·dro·gen ion (H+),

a hydrogen atom minus its electron and therefore carrying a unit positive charge (that is, a proton); in water, it combines with a water molecule to form hydronium ion, H5O2+, H7O3+, etc.

hy·dro·gen ion

(H+ hī'drō-jen ī'on)
A hydrogen atom minus its electron and therefore carrying a unit positive charge (i.e., a proton); in water, it combines with a water molecule to form the hydronium ion, H3O+.

hydrogen ion

A free proton, which is the positively charged nucleus of a hydrogen atom.