(A) Alkaline earth metals belong to Group $2$ of the periodic table.They have $2$ valence electrons in their outermost shell.To achieve a stable noble

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(A) Alkaline earth metals belong to Group $2$ of the periodic table.They have $2$ valence electrons in their outermost shell.To achieve a stable noble gas configuration,they lose these $2$ electrons,forming ions with a $+2$ charge.Therefore,the general formula for these ions is $M^{2+}$.