Electronegativity electron affinity compared

ELECTRON AFFINITY. I. Degree of electronegativity, or the extent to which an atom holds valence electrons in ils immediate neighborhood, compared to other atoms of the molecule. 

IE,IP) ionisation potential. Compare with adiabatic ionisation energy, vertical ionisation energy, electronegativity, and electron affinity. The energy needed to remove an electron from a gaseous atom or ion. 

In closing this Section, comparative studies on binary oxide semiconductors are available62,65,353,383 including one study383 where the electron affinities of several metal oxides (used as anodes in photoelectrolysis cells) were calculated from the atomic electronegativity values of the constituent elements. These electron affinity estimates were correlated with the Vih values measured for the same oxides in aqueous media.383... 

The linear acenes, benzene to pentacene, are used as examples of the CURES-EC procedure. The results obtained utilizing MINDO/3 and AMI are compared. In addition to calculating the Ea by subtracting the energies of the optimized form, the LUMO of the neutral is compared with the experimental Ea. The electron affinity of hexacene has been estimated from the electronegativity and experimental ionization potential. As a further example of the use of CURES-EC, both the ionization potential and electron affinity of heptacene are estimated. The Ea of octacene and nova-cene are calculated for comparison to values obtained by using Koopman s theorem and a semi-empirical method based on a variable-parameter modification of the Pariser Parr Pople (PPP) approximation to the Hartree Fock equation [10]. 

The S atom in the ground state has the electronic configuration [Ne]3s 3p with 2 unpaired p electrons ( Pj). Other atomic properties are ionization energy 999.30 kJ mo1 , electron affinities -1-200 and —414kJmol for the addition of the first and second electrons respectively, electronegativity (Pauling) 2.5, covalent radius 103 pm and ionic radius of 184 pm. These properties can be compared with those of the other elements in Group 16 on p. 754. 

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