Atomic or molecular systems in which the electrons are not completely assigned to orbitals in pairs.
Source:
PAC, 1999, 71, 1919
(Glossary of terms used in theoretical organic chemistry)
on page 1956
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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. doi:10.1351/goldbook.
