Akiba, Kin-ya Hiroshima University, Department of Chemistry, Faculty of Science, Kagamiyama, Higashi-Hiroshima, Japan.
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Group 1, 2, and 13–18 compounds which contain a number (N) of formally assignable electrons of more than eight (octet) in a valence shell directly associated with the central atom (X) in direct bonding with a number of ligands (L). The designation N-X-L is conveniently used to describe hypervalent molecules. See also: Electron configuration; Ligand; Valence
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