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): an atom or group that
replaces one or more hydrogen atoms attached to a parent structure or characteristic group except for hydrogen atoms attached to a chalcogen atom.
R-0.2.2.2 Characteristic group: a single heteroatoms, for example, 
and 
; a heteroatom bearing one or more
hydrogen atoms or other heteroatoms, for example, 
, 
, 
, 
, and 
; or a heteroatomic group attached to or containing a single
carbon atom, for example, 
, 
, 
, and 
, attached to a parent hydride. The most common of these groups are listed in Table 5 and
Table 9.
R-0.2.2.3 Principal group: the characteristic group chosen for citation at the end of a name by a suffix or a class name.
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