Magnesium reacts with an element (X) to form an ionic compoun. If the ground state electronic configuration of (X) is $1s^2 2s^2 2p^3$, the simplest formula for this compound is

Question

( A ) $Mg_2X$
( B ) $Mg_2X_3$
( C ) $Mg_3X_2$
( D ) $MgX_2$