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An ion is an electrically charged atom, charged due to the gain or loss of an electron, such as Fe++ (a cation, because the Fe atom has gained two electrons) or Cl- (an anion, because the Cl atom has lost an electron).

A molecule is a complex structure made up of more than 1 atom. They can be made from the same atom (like a molecule of oxygen, O2) or different atoms (like H2SO4).

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13y ago

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