* Electronegativity Difference: Nitrogen is more electronegative than hydrogen. This means nitrogen has a stronger pull on the shared electrons in the bond.
* Unequal Sharing: The shared electrons spend more time closer to the nitrogen atom, creating a partial negative charge (δ-) on the nitrogen and a partial positive charge (δ+) on the hydrogens.
* Dipole Moment: This uneven distribution of charge results in a dipole moment, where one end of the molecule is slightly negative and the other end is slightly positive.
Therefore, the N-H bond in ammonia is a polar covalent bond.
