Which gas is produced in the atmosphere due to lightning?

Nitrogen exists as a diatomic molecule $(N_2)$ and phosphorus as $P_4$. Why?

Laughing gas is prepared by heating

Which allotropic form of phosphorus is the most stable,least reactive,and possesses a graphite-like structure?

Nitrogen forms only $NCl_3$,whereas phosphorus forms both $PCl_3$ and $PCl_5$. Why?

Phosphorus has three allotropic forms:
$(i)$ white phosphorus
$(ii)$ red phosphorus and
$(iii)$ black phosphorus.
Write the difference between white and red phosphorus on the basis of their structure and reactivity.