Hybridization and Polarity?

📌 CONCEPT: The polarity of a molecule is determined by the difference in electronegativity between its atoms and the shape of its electron cloud, which is influenced by the hybridization of its central atom.

📐 RULE / FORMULA: The higher the percentage of s-character in the hybridization of the central atom, the more polar the molecule will be.

💡 WORKED EXAMPLE: Consider water (H2O) and ammonia (NH3) molecules. Water has a bent shape due to sp^3d hybridization, resulting in a more polar molecule. Ammonia, on the other hand, has a trigonal pyramidal shape due to sp^3d^2 hybridization, resulting in a less polar molecule.

⚠️ COMMON MISTAKE: Students often confuse hybridization with the shape of the molecule, but the actual polarity is determined by the electronegativity difference and the shape of the electron cloud, not just the shape of the molecule.