Magnesium reacts with an element (X) to ...

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

A

`Mg_(2)X_(3)`

B

`MgX_(2)`

C

`Mg_(2)X`

D

`Mg_(3)X_2`

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