Topic overview

Start with the big picture

The lesson introduces the Pauling scale and compares values for common atoms, then uses electronegativity differences to explain bond character and dipole direction. It covers periodic trends and the effect of carbon hybridization on electronegativity. These foundations are applied to inductive effects and acidity, intermolecular attractions, nucleophilicity, heterolytic bond cleavage, and oxidation states. The topic also considers how polarity contributes to the behavior of groups such as C=O, C–X, and N–H. Comparisons involving halogens and hydrogen halides illustrate why electronegativity alone does not determine acidity or reactivity; bond strength and resonance can also matter.