aufbau principle

https://doi.org/10.1351/goldbook.AT06996
A rule for building up the @E01995@ of atoms and molecules. It states that a maximum of two electrons are put into orbitals in the order of increasing @O04318@: the lowest-energy orbitals are filled before electrons are placed in higher-energy orbitals.
Source:
PAC, 1999, 71, 1919. (Glossary of terms used in theoretical organic chemistry) on page 1925 [Terms] [Paper]
Citation: 'aufbau principle' in IUPAC Compendium of Chemical Terminology, 3rd ed. International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. https://doi.org/10.1351/goldbook.AT06996 RIS BibTex EndNote
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Last revised: October 7, 2008