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An ion is an atom or group of atoms in which the number of electrons is different from the number of protons. These are 2 types:
Cation: A
 positively charged ion
Anion: A negative
ly charged ion

Aluminum - Al+3 (cation), Chloride - Cl-1 (anion)
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an atom or molecule with net electric charge due to loss or gain of one or more electron
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