Answer: Option (3) is the correct answer.
Explanation:
Atomic number of nitrogen is 7 and its electronic configuration is [tex]1s^{2}2s^{2}2p^{3}[/tex]. Thus, we can see that valency of nitrogen is 5.
So, one nitrogen atom has one lone pair of electron.
Therefore, when two nitrogen atoms will bond together then there will be three pairs of electrons bonded together and one lone pair of electron on each nitrogen atom.
