Is NCl3 Polar?

Nitrogen and chlorine have similar electronegativities, making individual N-Cl bond essentially non-polar. However, in NCl3, nitrogen uses only three of its five valence electrons to form bonds with chlorine. The lone pair of electrons on the nitrogen atom repels the bonded electron pairs away from itself and toward the chlorine atoms. This makes the molecule slightly polar due to the asymmetrical arrangement of the three N-Cl bonds.