Yes, ammonia (NH3) is a polar molecule. This polarity is primarily due to its molecular geometry and the electronegativity of its constituent atoms.
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In the NH3 molecule, there is one nitrogen atom bonded to three hydrogen atoms. Nitrogen is more electronegative than hydrogen, meaning it attracts the shared electrons in the N-H bonds more strongly. This creates a partial negative charge (δ–) near the nitrogen atom and a partial positive charge (δ+) near the hydrogen atoms.
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The molecular shape of NH3 is trigonal pyramidal, which is not symmetric. This geometric arrangement leads to an uneven distribution of electron density, resulting in a net dipole moment. As a result, NH3 exhibits properties typical of polar molecules, such as being soluble in water and having a higher boiling point compared to nonpolar substances of similar molecular weight.