Answer
Balanced equation: $3Mg(s) + N_2(g) --\gt Mg_3N_2(s)$
Reaction type: Combination.
Work Step by Step
$Mg(s) + N_2(g) --\gt Mg_3N_2(s)$
1. Balance the number of magnesium atoms, by putting a "3" in front of $Mg$.
$3Mg(s) + N_2(g) --\gt Mg_3N_2(s)$
2. Classify the reaction.
That reaction follows the pattern for a combination reaction (A + B −−> AB).
