PubChem atom environments

Table 2 Properties of organic atom type singletons

Atomic number	Atomic symbol	Number singletons	Charge		Valence
Atomic number	Atomic symbol	Number singletons	Minimum	Maximum	Minimum	Maximum
1	H	166	−99	126	0	91
6	C	351	−99	291	0	254
7	N	111	−67	7	0	36
8	O	82	−94	123	0	50
9	F	16	−2	0	1	137
15	P	231	−99	55	0	233
16	S	169	−99	127	0	234
17	Cl	16	−2	5	0	64
35	Br	17	−3	1	0	8
53	I	56	−5	7	0	171

ISSN: 1758-2946