where 𝜒̅ 7 C is the electronegativity of an atom in isolation, quantified as the average binding energy of valence electrons, and where ∆𝜒̅ 7 is the difference between the (all electron) average electron energy of a basin in a molecule 𝜒̅ 7 and an atom in isolation, 𝜒̅ 7(89&) ,