* Electronegativity Difference: Nitrogen (N) has a higher electronegativity than hydrogen (H). This means nitrogen attracts the shared electrons in the N-H bonds more strongly.
* Unequal Sharing: The unequal sharing of electrons results in a partial negative charge (δ-) on the nitrogen atom and partial positive charges (δ+) on the hydrogen atoms.
* Dipole Moment: This uneven distribution of charge creates a permanent dipole moment in the ammonia molecule, making the bonds polar covalent.
In summary: The difference in electronegativity between nitrogen and hydrogen leads to polar covalent bonds in ammonia, where the nitrogen atom has a partial negative charge and the hydrogen atoms have partial positive charges.
