The charge on the monatomic ions of Magnesium, Aluminum, Strontium, and Nitrogen are +2, +3, +2, and -3.
The charge on an ion is due to the valency of the atom.
The charge on the ion shows the number of electrons gained or lost by the atom in order to form an ion.
The charge on an ion depends on the group the element belongs to.
Therefore, the charge on the monatomic ions of Magnesium, Aluminum, Strontium, and Nitrogen are +2, +3, +2, and -3.
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