A molecule of ammonia (NH₃) contains polar covalent bonds. Each hydrogen atom forms a single covalent bond with the nitrogen atom, resulting in three sigma (σ) bonds. Nitrogen, with five valence electrons, shares one electron with each of the three hydrogen atoms. The sharing of electrons between nitrogen and hydrogen atoms leads to the formation of covalent bonds, with the electrons spending more time around the nitrogen atom due to its higher electronegativity. This creates a partial negative charge on nitrogen and partial positive charges on the hydrogen atoms, giving ammonia its polar nature.