Covalent Radius of the Elements

Unit

The covalent radius is a measure of the size of an atom that forms part of one covalent bond. It is usually measured either in picometres (pm) or angstroms (Å), with 1 Å = 100 pm.

Data available for 71 of 118 elements. Highest: Cesium (225 pm). Lowest: Helium (32 pm).

Visualize Covalent Radius in the periodic table →

118 elements

Covalent Radius of the Elements
		Symbol
55	Cesium	Cs	225
37	Rubidium	Rb	211
56	Barium	Ba	198
19	Potassium	K	196
38	Strontium	Sr	192
20	Calcium	Ca	174
57	Lanthanum	La	169
39	Yttrium	Y	162
71	Lutetium	Lu	160
75	Rhenium	Re	159
43	Technetium	Tc	156
11	Sodium	Na	154
47	Silver	Ag	153
72	Hafnium	Hf	150
80	Mercury	Hg	149
40	Zirconium	Zr	148
48	Cadmium	Cd	148
81	Thallium	Tl	148
82	Lead	Pb	147
74	Tungsten	W	146
83	Bismuth	Bi	146
42	Molybdenum	Mo	145
86	Radon	Rn	145
21	Scandium	Sc	144
49	Indium	In	144
79	Gold	Au	144
50	Tin	Sn	141
25	Manganese	Mn	139
29	Copper	Cu	138
51	Antimony	Sb	138
73	Tantalum	Ta	138
41	Niobium	Nb	137
77	Iridium	Ir	137
22	Titanium	Ti	136
45	Rhodium	Rh	135
52	Tellurium	Te	135
3	Lithium	Li	134
53	Iodine	I	133
30	Zinc	Zn	131
46	Palladium	Pd	131
12	Magnesium	Mg	130
54	Xenon	Xe	130
76	Osmium	Os	128
78	Platinum	Pt	128
24	Chromium	Cr	127
27	Cobalt	Co	126
31	Gallium	Ga	126
44	Ruthenium	Ru	126
23	Vanadium	V	125
26	Iron	Fe	125
32	Germanium	Ge	122
28	Nickel	Ni	121
33	Arsenic	As	119
13	Aluminum	Al	118
34	Selenium	Se	116
35	Bromine	Br	114
14	Silicon	Si	111
36	Krypton	Kr	110
15	Phosphorus	P	106
16	Sulfur	S	102
17	Chlorine	Cl	99
18	Argon	Ar	97
4	Beryllium	Be	90
5	Boron	B	82
6	Carbon	C	77
7	Nitrogen	N	75
8	Oxygen	O	73
9	Fluorine	F	71
10	Neon	Ne	69
1	Hydrogen	H	37
2	Helium	He	32
58	Cerium	Ce	—
59	Praseodymium	Pr	—
60	Neodymium	Nd	—
61	Promethium	Pm	—
62	Samarium	Sm	—
63	Europium	Eu	—
64	Gadolinium	Gd	—
65	Terbium	Tb	—
66	Dysprosium	Dy	—
67	Holmium	Ho	—
68	Erbium	Er	—
69	Thulium	Tm	—
70	Ytterbium	Yb	—
84	Polonium	Po	—
85	Astatine	At	—
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	—

Covalent Radius of the Elements

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