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Magnesium reacts with an element (X) to form

an ionic compound. If the ground state

electronic configuration of (X) is 1s2 2s2 2p3

the simplest formula for this compound is

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Element ($X$) electronic configuration

$1s^2$ $2s^2$ $2p^3$

So, valency of $X$ will be $3$.

Valency of $\\text{Mg}$ is $2$.

Formula of compound formed by $\\text{Mg}$ and $X$ will

be $\\text{Mg}_3X_2$.

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