bonding number 

https://doi.org/10.1351/goldbook.B00703
The bonding number n of a skeletal atom is the sum of the total number of bonding equivalents (valence bonds) of that skeletal atom to adjacent skeletal atoms in a parent hydride, if any, and the number of attached hydrogen atoms, if any. Examples: SH2: for S, n=2; SH6: for S, n=6.
Source:
Blue Book Guide, p. 21 [Terms] [Book]
See also:
PAC, 1984, 56, 769. (Treatment of variable valence in organic nomenclature (lambda convention) (Recommendations 1983)) on page 774 [Terms] [Paper]
Citation: 'bonding number' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.B00703 RIS BibTex EndNote
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Last revised: February 24, 2014