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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 compoundis
$$Mg_{3}X_{2}$$
$$Mg_{2} X$$
$$MgX_{2}$$
$$Mg_{2}X_{3}$$
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