Core electrons electronegativity

Two theoretical analyses of physicochemical parameters of carbon-containing molecules have been effected. " C(ls) core-electron binding energies, calculated from atomic charges obtained by an electronegativity equilization procedure, and enthalpies of formation, molecular geometries, dipole moments, and first ionization potentials, derived from an improved version (MINDO/3) of the MINDO semi-empirical SCF MO treatment," have all been shown to be in excellent agreeement with experimentally derived values. The results of a theoretical study... 

The octet rule states that an atom will give up, accept, or share electrons in order to fill its outer shell or attain an outer shell with eight electrons. Electropositive elements readily lose electrons electronegative elements readily acquire electrons. The electronic configuration of an atom describes the orbitals occupied by the atom s electrons. Electrons in inner shells are called core electrons electrons in the outermost shell are called valence electrons. Lone-pair electrons are valence electrons that are not used in... 

However, this is not surprising because Ihe actual definition of electronegativity and chemical hardness reflects the holding power wifii which the whole atom attracts valence electrons to its center. There is therefore natural that as the atom is richer in core electrons down groups lesser is the attractive force on the outer electrons from the center of the atom. In this respect, the actual scales mirror at the best the atomic stability at the valence shell. 

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