* Molecular Geometry: NCl₃ has a trigonal pyramidal shape. The nitrogen atom is at the center, with three chlorine atoms attached and a lone pair of electrons on the nitrogen.
* Electronegativity Difference: Chlorine is more electronegative than nitrogen. This means that the chlorine atoms pull the shared electrons in the N-Cl bonds closer to themselves, creating partial negative charges (δ-) on the chlorine atoms and a partial positive charge (δ+) on the nitrogen atom.
* Asymmetrical Charge Distribution: The three polar N-Cl bonds and the lone pair on the nitrogen atom don't cancel each other out. This creates a net dipole moment in the molecule, pointing towards the chlorine atoms.
Therefore, due to the polar N-Cl bonds and the asymmetrical charge distribution, NCl₃ is a polar molecule.
