Atomic radii of the elements (data page)

<< Chemical elements data references

Atomic radii

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

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

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. 1963, 38, 2686.

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.