Question

What is the valency of nitrogen in ${\mathrm{Mg}}_3{\mathrm{N}}_2$?

Answer 1

The valency of nitrogen in ${\mathrm{Mg}}_3{\mathrm{N}}_2$ can be calculated by applying the criss-cross method :

$$\begin{gathered} \mathrm{Symbol}\mathrm{Mg}\mathrm{N} \\ \searrow \swarrow \\ \mathrm{Valency}23 \end{gathered}$$

Thus, by applying the criss-cross the valency of nitrogen is $3$