A3: Covalent Radii

The values of Table 3 show the covalent radii from the two recent original determinations by Cordero et al.[1], and Pyykkö and Atsumi [2]. The differences between the two single-bond values are often explained by the different coordination numbers in the two data bases used. When the effective radii do not follow the natural order single > double > triple, it means that the changes in the radii of the ligands are even larger than those for the considered element.

Atomic Number	Element	Covalent radii
		Single Bonds [1]	Single Bonds [2]	Double Bonds [2]	Triple Bonds [2]
1	H	31	32	-	-
2	He	28	46	-	-
3	Li	128	133	124	-
4	Be	96	102	90	85
5	B	84	85	78	73
6	C	76	75	67	60
7	N	71	71	60	54
8	O	66	63	57	53
9	F	57	64	59	53
10	Ne	58	67	96	-
11	Na	166	155	160	-
12	Mg	141	139	132	127
13	Al	121	126	113	111
14	Si	111	116	107	102
15	P	107	111	102	94
16	S	105	103	94	95
17	Cl	102	99	95	93
18	Ar	106	96	107	96
19	K	203	196	193	-
20	Ca	176	171	147	133
21	Sc	170	148	116	114
22	Ti	160	136	117	108
23	v	153	134	112	106
24	Cr	139	122	111	103
25	Mn	150	119	105	103
26	Fe	142	116	109	102
27	Co	138	111	103	96
28	Ni	124	110	101	101
29	Cu	132	112	115	120
30	Zn	122	118	120	-
31	Ga	122	124	117	121
32	Ge	120	121	111	114
33	As	119	121	114	106
34	Se	120	116	107	107
35	Br	120	114	109	110
36	Kr	116	117	121	108
37	Rb	220	210	202	-
38	Sr	195	185	157	139
39	Y	190	163	130	124
40	Zr	175	154	127	121
41	Nb	164	147	125	116
42	Mo	154	138	121	113
43	Tc	147	128	120	110
44	Ru	146	125	114	103
45	Rh	142	125	110	106
46	Pd	139	120	117	112
47	Ag	145	128	139	137
48	Cd	144	136	144	-
49	In	142	142	136	146
50	Sn	139	140	130	132
51	Sb	139	140	133	127
52	Te	138	136	128	121
53	I	139	133	129	125
54	Xe	140	131	135	122
55	Cs	244	232	209	-
56	Ba	215	196	161	149
57	La	207	180	139	139
58	Ce	204	163	137	131
59	Pr	203	176	138	128
60	Nd	201	174	137	-
61	Pm	199	173	135	-
62	Sm	198	172	134	-
63	Eu	198	168	134	-
64	Gd	196	169	135	132
65	Tb	194	168	135	-
66	Dy	192	167	133	-
67	Ho	192	166	133	-
68	Er	189	165	133	-
69	Tm	190	164	131	-
70	Yb	187	170	129	-
71	Lu	187	162	131	131
72	Hf	175	152	128	122
73	Ta	170	146	126	119
74	W	162	137	120	115
75	Re	151	131	119	110
76	Os	144	129	116	109
77	Ir	141	122	115	107
78	Pt	136	123	112	110
79	Au	136	124	121	123
80	Hg	132	133	142	-
81	Tl	145	144	142	150
82	Pb	146	144	135	137
83	Bi	148	151	141	135
84	Po	140	145	135	129
85	At	150	147	138	138
86	Rn	150	142	145	133
87	Fr	260	223	218	-
88	Ra	221	201	173	159
89	Ac	215	186	153	140
90	Th	206	175	143	136
91	Pa	200	169	138	129
92	U	196	170	134	118
93	Np	190	171	136	116
94	Pu	187	172	135	-
95	Am	180	166	135	-
96	Cm	169	166	136	-
97	Bk	-	168	139	-
98	Cf	-	168	140	-
99	Es	-	165	140	-
100	Fm	-	167	-	-
101	Md	-	173	139	-
102	No	-	176	159	-
103	Lr	-	161	141	-
104	Rf	-	157	140	131
105	Db	-	149	136	126
106	Sg	-	143	128	121
107	Bh	-	141	128	119
108	Hs	-	134	125	118
109	Mt	-	129	125	113
110	Ds	-	128	116	112
111	Rg	-	121	116	118
112	Cn	-	122	137	130
113	Uut	-	136	-	-
114	Uuq	-	143	-	-
115	Uup	-	162	-	-
116	Uuh	-	175	-	-
117	Uus	-	165	-	-
118	Uuo	-	157	-	-

References

1. Beatriz Cordero, Verónica Gómez, Ana E. Platero-Prats, Marc Revés, Jorge Echeverría, Eduard Cremades, Flavia Barragán and Santiago Alvarez (2008). "Covalent radii revisited". Dalton Trans. (21): 2832–2838 http://dx.doi.org/10.1039/b801115j
2. Pekka Pyykkö, Michiko Atsumi (2009). "Molecular Double-Bond Covalent Radii for Elements Li–E112". Chemistry: A European Journal 15 (46): 12770–12779. dx.doi.org/10.1002/chem.200901472

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