A rule for building up the
electronic configuration of atoms and molecules. It states that a maximum of two electrons are put into orbitals
in the order of increasing
orbital energy: the lowest-energy orbitals are filled before electrons are placed in higher-energy
orbitals.
Source:
Cite as:
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.
https://doi.org/10.1351/goldbook.
