Question

Nitrogen have only 3 electrons unpaired electrons in p orbital why

Answer 1

The atomic number of Nitrogen is 7.
while filling the electrons into the orbitals,the electronic configuration:
$1 {s}^{2} \: 2 {s}^{2} 2 {p}^{3}$
thus by this way Nitrogen has 3 unpaired electrons in co- orbital.
in total P sub-shell 6 electrons,first three are unpaired,one in each of lower spin.from 4th electron entered into p pairing starts.