Draw the electron dot structure of nitrogen and write the type of bonding seen in this.

Separate ionic compounds and covalent compounds in the given group. Give a reason for your choice.

${\mathrm{MgCl}}_2$,${\mathrm{CCl}}_4$, $\mathrm{CaO}$, ${\mathrm{CH}}_4$

The formation of ${\mathrm{Mg}}_2$ will be possible? Give reasons for your answer.