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  Home > JCE Print > Journal of Chemical Education > Issues > 2004  > June  >
Research: Science and Education
Effects of Exchange Energy and Spin-Orbit Coupling on Bond Energies
Derek W. Smith
Department of Chemistry, University of Waikato, Hamilton, New Zealand
Cover
June 2004
Vol. 81 No. 6
p. 886
Abstract
It is shown that the ground states of atoms having pn configurations are stabilized by exchange energy (n = 2, 3, or 4) and/or spin–orbit coupling (n = 1, 2, 4, or 5). The extent of such stabilization is given by the barycenter of all states arising from the pn configuration relative to the ground state, obtainable from tabulations of atomic spectra. The stabilization of A(g) and/or B(g) has the effect of lowering the mean bond energy DA-B in ABn.When bond energies are adjusted to take account of these effects, periodic trends exhibit fewer discontinuities and anomalies. For example, adjusted bond energies D'A-H increase monotonically and almost linearly across each of the np series, as would be predicted from size and electronegativity considerations.
More Information
*  Citation
 Smith, Derek W. J. Chem. Educ. 2004 81 886.
*  Keywords
 Atomic Properties / Structure; Bonding Theory; Main-Group Elements; Molecular Properties / Structure; Periodicity / Periodic Table
*  History
 Created:
Last Updated:		 May 2, 2004
January 21, 2005
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