An atom represented by X forms a compound with the formula X3N2. The atom could be
A) Na
B) Al
C) Cs
D) Mg

D) Mg .

Explanation:

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In this case, since compounds with the formula X3N2 suggest that the oxidation state of X is +2 because the oxidation state of nitrogen is -3 as it gains three electrons in order to attain a complete octet; among the given options, just magnesium (option D) Mg ) has such charge as it is in group 2A, which suggests it loses two electrons when forming ionic compounds:

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