Atomic radii of the elements (data page)

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[edit] 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

[edit] 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

[edit] References

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

[edit] Atomic radius (empirical)

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

[edit] Atomic radius (calculated)

  • E. Clementi, D.L.Raimondi, and W.P. Reinhardt, J. Chem. Phys. 1963, 38, 2686.

[edit] Van der Waals radius

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

[edit] 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.

[edit] See Also

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