Calculated Atomic Radius of the Elements

Unit

The atomic radius is the distance from the center of the nucleus to the outermost electrons. Since the electron cloud has no sharp boundary, several non-equivalent definitions exist (van der Waals, ionic, metallic, covalent). Calculated values are derived from theoretical models of isolated atoms.

Data available for 84 of 118 elements. Highest: Cesium (298 pm). Lowest: Helium (31 pm).

Visualize Calculated Atomic Radius in the periodic table →

118 elements

Calculated Atomic Radius of the Elements
		Symbol
55	Cesium	Cs	298
37	Rubidium	Rb	265
56	Barium	Ba	253
59	Praseodymium	Pr	247
19	Potassium	K	243
62	Samarium	Sm	238
64	Gadolinium	Gd	233
63	Europium	Eu	231
66	Dysprosium	Dy	228
67	Holmium	Ho	226
68	Erbium	Er	226
65	Terbium	Tb	225
69	Thulium	Tm	222
70	Ytterbium	Yb	222
38	Strontium	Sr	219
71	Lutetium	Lu	217
39	Yttrium	Y	212
72	Hafnium	Hf	208
40	Zirconium	Zr	206
60	Neodymium	Nd	206
61	Promethium	Pm	205
73	Tantalum	Ta	200
41	Niobium	Nb	198
20	Calcium	Ca	194
74	Tungsten	W	193
11	Sodium	Na	190
42	Molybdenum	Mo	190
75	Rhenium	Re	188
76	Osmium	Os	185
21	Scandium	Sc	184
43	Technetium	Tc	183
77	Iridium	Ir	180
44	Ruthenium	Ru	178
78	Platinum	Pt	177
22	Titanium	Ti	176
79	Gold	Au	174
45	Rhodium	Rh	173
23	Vanadium	V	171
80	Mercury	Hg	171
46	Palladium	Pd	169
3	Lithium	Li	167
24	Chromium	Cr	166
47	Silver	Ag	165
25	Manganese	Mn	161
48	Cadmium	Cd	161
26	Iron	Fe	156
49	Indium	In	156
81	Thallium	Tl	156
82	Lead	Pb	154
27	Cobalt	Co	152
28	Nickel	Ni	149
12	Magnesium	Mg	145
29	Copper	Cu	145
50	Tin	Sn	145
83	Bismuth	Bi	143
30	Zinc	Zn	142
31	Gallium	Ga	136
84	Polonium	Po	135
51	Antimony	Sb	133
85	Astatine	At	127
32	Germanium	Ge	125
52	Tellurium	Te	123
86	Radon	Rn	120
13	Aluminum	Al	118
53	Iodine	I	115
33	Arsenic	As	114
4	Beryllium	Be	112
14	Silicon	Si	111
54	Xenon	Xe	108
34	Selenium	Se	103
15	Phosphorus	P	98
35	Bromine	Br	94
16	Sulfur	S	88
36	Krypton	Kr	88
5	Boron	B	87
17	Chlorine	Cl	79
18	Argon	Ar	71
6	Carbon	C	67
7	Nitrogen	N	56
1	Hydrogen	H	53
8	Oxygen	O	48
9	Fluorine	F	42
10	Neon	Ne	38
2	Helium	He	31
57	Lanthanum	La	—
58	Cerium	Ce	—
87	Francium	Fr	—
88	Radium	Ra	—
89	Actinium	Ac	—
90	Thorium	Th	—
91	Protactinium	Pa	—
92	Uranium	U	—
93	Neptunium	Np	—
94	Plutonium	Pu	—
95	Americium	Am	—
96	Curium	Cm	—
97	Berkelium	Bk	—
98	Californium	Cf	—
99	Einsteinium	Es	—
100	Fermium	Fm	—
101	Mendelevium	Md	—
102	Nobelium	No	—
103	Lawrencium	Lr	—
104	Rutherfordium	Rf	—
105	Dubnium	Db	—
106	Seaborgium	Sg	—
107	Bohrium	Bh	—
108	Hassium	Hs	—
109	Meitnerium	Mt	—
110	Darmstadtium	Ds	—
111	Roentgenium	Rg	—
112	Copernicium	Cn	—
113	Nihonium	Nh	—
114	Flerovium	Fl	—
115	Moscovium	Mc	—
116	Livermorium	Lv	—
117	Tennessine	Ts	—
118	Oganesson	Og	—

Calculated Atomic Radius of the Elements

Related properties