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Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is $1s^2 2s^2 2p^3$, the simplest formula for this compound is
Explanation
X is nitrogen ($X^{3-}$) and Mg forms $Mg^{2+}$, giving $Mg_3X_2$.
Detailed Solution
Element (X) electronic configuration: $1s^2 2s^2 2p^3$
So, the valency of X will be 3. Valency of Mg is 2.
Formula of the compound formed by Mg and X will be $Mg_3X_2$.