Nitrogen has unique ability to form Pπ–Pπ multiple bonds with itself and with other elements due to

Nitrogen has unique ability to form Pπ−Pπ multiple bonds with itself and with other elements due to small size and high electronegativity. The inner core of nitrogen contains only 1s electrons. There is no repulsion between non bonded electrons of inner core. Hence p orbitals easily overlap to form pi bonds.