2. Give any two examples of formation of ions.
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Sodium ion Na+, magnesium ion Mg2+
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An ion is formed by the loss or gain of electrons by an atom, so it contains an unequal number of electrons and protons. Example: Sodium ion Na+, magnesium ion Mg2+, chloride ion Cl–, and oxide ion O2–. There are two types of ions : cations.
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