Atomic Radius of the Elements

Unit

The empirical atomic radius is determined experimentally from measurements of bond lengths in crystalline structures, corrected for bond type. Values are given in picometres (pm), typically with an accuracy of about 5 pm.

Data available for 88 of 118 elements. Highest: Cesium (260 pm). Lowest: Hydrogen (25 pm).

Visualize Atomic Radius in the periodic table →

118 elements

Atomic Radius of the Elements
		Symbol
55	Cesium	Cs	260
37	Rubidium	Rb	235
19	Potassium	K	220
56	Barium	Ba	215
88	Radium	Ra	215
38	Strontium	Sr	200
57	Lanthanum	La	195
89	Actinium	Ac	195
81	Thallium	Tl	190
84	Polonium	Po	190
58	Cerium	Ce	185
59	Praseodymium	Pr	185
60	Neodymium	Nd	185
61	Promethium	Pm	185
62	Samarium	Sm	185
63	Europium	Eu	185
11	Sodium	Na	180
20	Calcium	Ca	180
39	Yttrium	Y	180
64	Gadolinium	Gd	180
82	Lead	Pb	180
90	Thorium	Th	180
91	Protactinium	Pa	180
65	Terbium	Tb	175
66	Dysprosium	Dy	175
67	Holmium	Ho	175
68	Erbium	Er	175
69	Thulium	Tm	175
70	Ytterbium	Yb	175
71	Lutetium	Lu	175
92	Uranium	U	175
93	Neptunium	Np	175
94	Plutonium	Pu	175
95	Americium	Am	175
21	Scandium	Sc	160
47	Silver	Ag	160
83	Bismuth	Bi	160
40	Zirconium	Zr	155
48	Cadmium	Cd	155
49	Indium	In	155
72	Hafnium	Hf	155
12	Magnesium	Mg	150
80	Mercury	Hg	150
3	Lithium	Li	145
41	Niobium	Nb	145
42	Molybdenum	Mo	145
50	Tin	Sn	145
51	Antimony	Sb	145
73	Tantalum	Ta	145
22	Titanium	Ti	140
24	Chromium	Cr	140
25	Manganese	Mn	140
26	Iron	Fe	140
46	Palladium	Pd	140
52	Tellurium	Te	140
53	Iodine	I	140
23	Vanadium	V	135
27	Cobalt	Co	135
28	Nickel	Ni	135
29	Copper	Cu	135
30	Zinc	Zn	135
43	Technetium	Tc	135
45	Rhodium	Rh	135
74	Tungsten	W	135
75	Rhenium	Re	135
77	Iridium	Ir	135
78	Platinum	Pt	135
79	Gold	Au	135
31	Gallium	Ga	130
44	Ruthenium	Ru	130
76	Osmium	Os	130
13	Aluminum	Al	125
32	Germanium	Ge	125
33	Arsenic	As	115
34	Selenium	Se	115
35	Bromine	Br	115
14	Silicon	Si	110
4	Beryllium	Be	105
15	Phosphorus	P	100
16	Sulfur	S	100
17	Chlorine	Cl	100
5	Boron	B	85
18	Argon	Ar	71
6	Carbon	C	70
7	Nitrogen	N	65
8	Oxygen	O	60
9	Fluorine	F	50
1	Hydrogen	H	25
2	Helium	He	—
10	Neon	Ne	—
36	Krypton	Kr	—
54	Xenon	Xe	—
85	Astatine	At	—
86	Radon	Rn	—
87	Francium	Fr	—
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	—

Atomic Radius of the Elements

Related properties