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An ion is a atom/molecule with a net electric charge, because of a loss/gain of one or more electrons.
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Hello,

in chemistry, a ion is an atom with an electrical charge. An atom becomes a ion if it cedes or obtains an electron.

If the number of electrons is bigger, then it is a negative ion also called anion; if the number of protons is bigger, then it is a positive ion also called cation.