What is the formula of magnesium nitride?

A.     ${\text{M}}{{\text{g}}_{\text{2}}}{{\text{N}}_{\text{3}}}$

B.     ${\text{M}}{{\text{g}}_{\text{3}}}{{\text{N}}_{\text{2}}}$

C.     ${\text{Mg(N}}{{\text{O}}_{\text{3}}}{{\text{)}}_{\text{2}}}$

D.     ${\text{Mg(N}}{{\text{O}}_{\text{2}}}{{\text{)}}_{\text{2}}}$

B