Ion
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State
An ion is an atom or molecule whose electron count no longer equals its proton count, giving it a net charge.
Show
A neutral sodium atom, 11 protons and 11 electrons, becomes the Na+ ion after losing one electron: 11 protons, 10 electrons.
Watch for
An ion's proton count never changes — only its electron count does. Isotopes instead vary in neutrons, never in charge.