Atomic radius/Catalogs

Atomic Radii by Element Number

Note: All measurements given are in picometres (pm).

number	symbol	name	empirical †	calculated	van der Waals	covalent	triple-bond covalent radii	metallic radii
1	H	hydrogen	25	53	120	37	no data
2	He	helium	no data	31	140	32	no data
3	Li	lithium	145	167	182	134	no data	152
4	Be	beryllium	105	112	no data	90	85	112
5	B	boron	85	87	no data	82	73
6	C	carbon	70	67	170	77	60
7	N	nitrogen	65	56	155	75	54
8	O	oxygen	60	48	152	73	53
9	F	fluorine	50	42	147	71	53
10	Ne	neon	no data	38	154	69	no data
11	Na	sodium	180	190	227	154	no data	186
12	Mg	magnesium	150	145	173	130	127	160
13	Al	aluminium	125	118	no data	118	111	143
14	Si	silicon	110	111	210	111	102
15	P	phosphorus	100	98	180	106	94
16	S	sulphur	100	88	180	102	95
17	Cl	chlorine	100	79	175	99	93
18	Ar	argon	71	71	188	97	96
19	K	potassium	220	243	275	196	no data	227
20	Ca	calcium	180	194	no data	174	133	197
21	Sc	scandium	160	184	no data	144	114	162 a
22	Ti	titanium	140	176	no data	136	108	147
23	V	vanadium	135	171	no data	125	106	134 a
24	Cr	chromium	140	166	no data	127	103	128 a
25	Mn	manganese	140	161	no data	139	103	127 a
26	Fe	iron	140	156	no data	125	102	126 a
27	Co	cobalt	135	152	no data	126	96	125 a
28	Ni	nickel	135	149	163	121	101	124 a
29	Cu	copper	135	145	140	138	120	128 a
30	Zn	zinc	135	142	139	131	no data	134 a
31	Ga	gallium	130	136	187	126	121	135 b
32	Ge	germanium	125	125	no data	122	114
33	As	arsenic	115	114	185	119	106
34	Se	selenium	115	103	190	116	107
35	Br	bromine	115	94	185	114	110
36	Kr	krypton	no data	88	202	110	108
37	Rb	rubidium	235	265	no data	211	no data	248
38	Sr	strontium	200	219	no data	192	139	215
39	Y	yttrium	180	212	no data	162	124	180 a
40	Zr	zirconium	155	206	no data	148	121	160
41	Nb	niobium	145	198	no data	137	116	146 a
42	Mo	molybdenum	145	190	no data	145	113	139 a
43	Tc	technetium	135	183	no data	156	110	136 a
44	Ru	ruthenium	130	178	no data	126	103	134 a
45	Rh	rhodium	135	173	no data	135	106	134 a
46	Pd	palladium	140	169	163	131	112	137 a
47	Ag	silver	160	165	172	153	137	144 a
48	Cd	cadmium	155	161	158	148	no data	151 a
49	In	indium	155	156	193	144	146	167
50	Sn	tin	145	145	217	141	132
51	Sb	antimony	145	133	no data	138	127
52	Te	tellurium	140	123	206	135	121
53	I	iodine	140	115	198	133	125
54	Xe	xenon	no data	108	216	130	122
55	Cs	caesium	260	298	no data	225	no data	265
56	Ba	barium	215	253	no data	198	149	222
57	La	lanthanum	195	no data	no data	169	139	187 a
58	Ce	cerium	185	no data	no data	no data	131	181.8 b
59	Pr	praseodymium	185	247	no data	no data	128	182.4 b
60	Nd	neodymium	185	206	no data	no data	no data	181.4 b
61	Pm	promethium	185	205	no data	no data	no data	183.4 b
62	Sm	samarium	185	238	no data	no data	no data	180.4 b
63	Eu	europium	185	231	no data	no data	no data	208.4 b
64	Gd	gadolinium	180	233	no data	no data	132	180.4 b
65	Tb	terbium	175	225	no data	no data	no data	177.3 b
66	Dy	dysprosium	175	228	no data	no data	no data	178.1 b
67	Ho	holmium	175	no data	no data	no data	no data	176.2 b
68	Er	erbium	175	226	no data	no data	no data	176.1 b
69	Tm	thulium	175	222	no data	no data	no data	175.9 b
70	Yb	ytterbium	175	222	no data	no data	no data	193.3 b
71	Lu	lutetium	175	217	no data	160	131	173.8 b
72	Hf	hafnium	155	208	no data	150	122	159
73	Ta	tantalum	145	200	no data	138	119	146 a
74	W	tungsten	135	193	no data	146	115	139 a
75	Re	rhenium	135	188	no data	159	110	137 a
76	Os	osmium	130	185	no data	128	109	135 a
77	Ir	iridium	135	180	no data	137	107	135.5 a
78	Pt	platinum	135	177	175	128	110	138.5 a
79	Au	gold	135	174	166	144	123	144 a
80	Hg	mercury	150	171	155	149	no data	151 a
81	Tl	thallium	190	156	196	148	150	170
82	Pb	lead	180	154	202	147	137
83	Bi	bismuth	160	143	no data	146	135
84	Po	polonium	190	135	no data	no data	129
85	At	astatine	no data	no data	no data	no data	138
86	Rn	radon	no data	120	no data	145	133
87	Fr	francium	no data	no data	no data	no data	no data	no data
88	Ra	radium	215	no data	no data	no data	159	no data
89	Ac	actinium	195	no data	no data	no data	140
90	Th	thorium	180	no data	no data	no data	136	179 a
91	Pa	protactinium	180	no data	no data	no data	129	163 c
92	U	uranium	175	no data	186	no data	118	156 d
93	Np	neptunium	175	no data	no data	no data	116	155 d
94	Pu	plutonium	175	no data	no data	no data	no data	159 d
95	Am	americium	175	no data	no data	no data	no data	173 a
96	Cm	curium	no data	no data	no data	no data	no data	174 a
97	Bk	berkelium	no data	no data	no data	no data	no data	170 a
98	Cf	californium	no data	no data	no data	no data	no data	186+/- 2 a
99	Es	einsteinium	no data	no data	no data	no data	no data	186+/- 2 a
100	Fm	fermium	no data	no data	no data	no data	no data	no data
101	Md	mendelevium	no data	no data	no data	no data	no data	no data
102	No	nobelium	no data	no data	no data	no data	no data	no data
103	Lr	lawrencium	no data	no data	no data	no data	no data	no data
104	Rf	rutherfordium	no data	no data	no data	no data	131	no data
105	Db	dubnium	no data	no data	no data	no data	126	no data
106	Sg	seaborgium	no data	no data	no data	no data	121	no data
107	Bh	bohrium	no data	no data	no data	no data	119	no data
108	Hs	hassium	no data	no data	no data	no data	118	no data
109	Mt	meitnerium	no data	no data	no data	no data	113	no data
110	Ds	darmstadtium	no data	no data	no data	no data	112	no data
111	Rg	roentgenium	no data	no data	no data	no data	118	no data
112	Uub	ununbium	no data	no data	no data	no data	130	no data
113	Uut	ununtrium	no data	no data	no data	no data	no data	no data
114	Uuq	ununquadium	no data	no data	no data	no data	no data	no data
115	Uup	ununpentium	no data	no data	no data	no data	no data	no data
116	Uuh	ununhexium	no data	no data	no data	no data	no data	no data

Notes

• The radius of an atom is not a uniquely defined property and depends on the definition. Data derived from other sources with different assumptions cannot be compared.
• † to an accuracy of about 5 pm
• (a) 12 coordinate
• (b) gallium has an anomalous crystal structure
• (c) 10 coordinate
• (d) uranium, neptunium and plutonium have irregular structures

References

As quoted at http://www.webelements.com/ from these sources:

Atomic radius (empirical)

• J.C. Slater, J. Chem. Phys. 1964, 41, 3199.

Atomic radius (calculated)

• E. Clementi, D.L.Raimondi, and W.P. Reinhardt, J. Chem. Phys. 1967, 47, 1300.

Van der Waals radius

• A. Bondi, J. Phys. Chem., 1964, 68, 441.

Covalent radius

• R.T. Sanderson in Chemical Periodicity, Reinhold, New York, USA, 1962.
• L.E. Sutton (ed.) in Table of interatomic distances and configuration in molecules and ions, Supplement 1956-1959, Special publication No. 18, Chemical Society, London, UK, 1965.
• J.E. Huheey, E.A. Keiter, and R.L. Keiter in Inorganic Chemistry : Principles of Structure and Reactivity, 4th edition, HarperCollins, New York, USA, 1993.
• W.W. Porterfield in Inorganic chemistry, a unified approach, Addison Wesley Publishing Co., Reading Massachusetts, USA, 1984.
• A.M. James and M.P. Lord in Macmillan's Chemical and Physical Data, Macmillan, London, UK, 1992.

Triple-Bond Covalent Radii

• P.Pyykkö, S. Riedel, M. Patzschke, Chem. Eur. J. 2005, 12, 3511 - 3520. Mean-square deviation 3pm.
• Triple-Bond Covalent Radii Table online: http://www.psichem.de/triple-bond/index.htm