Electronegativity and Electron Affinity

Abstract

Various consequences of the supposition that the value of the resonance integral /?ab depends on the nature of the bond are evaluated within the framework of the simple Hückel method. The resulting equation for /?aB in function of the polarity 1 of the AB bond is:/?AB = (1 -J2) -1/t [C+(V2) J" (aA-a B)d7] where ax is the Coulomb integral. A solution is proposed corresponding with /?ab = (ßAA' /?bb) Further elaboration then suggests that the simple Hückel method in this form is in favour of the ionic approximation to chemical bonding. The Coulomb integral turns out to be the electron affinity, which must now be considered as the electronegativity of elements when forming chemical bonds.

On the Electron Affinities of Halogens and the Strength of Ionic Interactions

“…Recent determinations of EA values for alkalimetals 4 ' 5 seem to support our earlier statements about the stability of homonuclear bonds 6 . This may be taken as a further justification for the validity of rule 2 and of our present argumentation.…”

“…Extension of this procedure to other series of alkalisalt molecules would lead to similar conclusions for EAX, as already obtained for Fxx in earlier work 7 , on account of the relation EAx = Fxx 3 ' 6 . This consistently answers the discrepancy observed for LiF in the AF series discussed above, although even the existence of this discrepancy does not affect the conclusion concerning the revision of the EA values for halogens.…”