In Mg⁺² the magnesium ion owns 10 electrons.

Name: In Mg +2 the magnesium ion owns 10 electrons.
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Mg has an atomic number of 12, meaning it has 12 protons in its nucleus. In a neutral atom, the number of protons equals the number of electrons. Therefore, Mg has 12 electrons. In Mg⁺², the +2 charge indicates that Mg has lost two electrons, leaving it with only 10 electrons.

In Mg+2 the Magnesium Ion Owns 10 Electrons

In Mg⁺² the Magnesium Ion Owns 10 Electrons