Rules establishing correspondence between the topology of a molecular structure and
the number of electrons which may be placed into its bonding molecular orbitals.
In the origin of various electron-counting rules lies a general assumption that the
completeness of the valence
electron shell of a molecular entity belonging to a certain structural type serves
as the major criterion of structural stability
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook