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Principles of Organic Nomenclature

R-1.1.1 Definition

The bonding number "n" of a skeletal atom is the sum of the total number of bonding equivalents (valence bonds) of the skeletal atom to adjacent skeletal atoms in a parent hydride, if any, and the number of attached hydrogen atoms, if any.

Examples to R-1.1.1

for S, n = 2
for S, n = 6
for P, n = 5
for P, n = 3
Next:
R-1.1.2 Standard bonding numbers
R-1.1.3 Nonstandard bonding numbers
R-1.1.4 Contiguous formal double bonds
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This HTML reproduction is as close as possible to the published version [see IUPAC, Commission on Nomenclature of Organic Chemistry. A Guide to IUPAC Nomenclature of Organic Compounds (Recommendations 1993), 1993, Blackwell Scientific publications, Copyright 1993 IUPAC]. If you need to cite these rules please quote this reference as their source.

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