Electronegativity Scales (Pauling's Scale)

Concept: Determines the relative scale of an atom's power to attract shared bonding electrons, modeled through the divergence of real bond energies from idealized covalent expectations.

Notation:

• $$X_A, X_B$$ = Electronegativity values of atoms A and B;
• $$\Delta$$ = Resonance energy factor in $$\text{kcal mol}^{-1}$$ , where
• $$\Delta = E_{A-B} - \sqrt{E_{A-A} \cdot E_{B-B}}$$