Atomic radii of the elements (data page)
<< Chemical elements data references
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Note: All measurements given are in picometres (pm).
| number | symbol | name
| empirical †
| calculated
| van der Waals
| covalent
| triple-bond
covalent radii
| metallic radii
|
| 1 | H | hydrogen
| 75
| 53
| 120
| 37
| no data
|
|
| 2 | He | helium
| no data
| 31
| 140
| 32
| no data
|
|
| 3 | Li | lithium
| 145
| 167
| 182
| 134
| no data
| 152
|
| 4 | Be | beryllium
| 105
| 112
| no data
| 90
| 85
| 112
|
| 5 | B | boron
| 85
| 87
| no data
| 82
| 73
|
|
| 6 | C | carbon
| 70
| 67
| 170
| 77
| 60
|
|
| 7 | N | nitrogen
| 65
| 56
| 155
| 75
| 54
|
|
| 8 | O | oxygen
| 60
| 48
| 152
| 73
| 53
|
|
| 9 | F | fluorine
| 50
| 42
| 147
| 71
| 53
|
|
| 10 | Ne | neon
| no data
| 38
| 154
| 69
| no data
|
|
| 11 | Na | sodium
| 180
| 190
| 227
| 154
| no data
| 186
|
| 12 | Mg | magnesium
| 150
| 145
| 173
| 130
| 127
| 160
|
| 13 | Al | aluminium
| 125
| 118
| no data
| 118
| 111
| 143
|
| 14 | Si | silicon
| 110
| 111
| 210
| 111
| 102
|
|
| 15 | P | phosphorus
| 100
| 98
| 180
| 106
| 94
|
|
| 16 | S | sulfur
| 100
| 88
| 180
| 102
| 95
|
|
| 17 | Cl | chlorine
| 100
| 79
| 175
| 99
| 93
|
|
| 18 | Ar | argon
| 71
| 71
| 188
| 97
| 96
|
|
| 19 | K | potassium
| 220
| 243
| 275
| 196
| no data
| 227
|
| 20 | Ca | calcium
| 180
| 194
| no data
| 174
| 133
| 197
|
| 21 | Sc | scandium
| 160
| 184
| no data
| 144
| 114
| 162 a
|
| 22 | Ti | titanium
| 140
| 176
| no data
| 136
| 108
| 147
|
| 23 | V | vanadium
| 135
| 171
| no data
| 125
| 106
| 134 a
|
| 24 | Cr | chromium
| 140
| 166
| no data
| 127
| 103
| 128 a
|
| 25 | Mn | manganese
| 140
| 161
| no data
| 139
| 103
| 127 a
|
| 26 | Fe | iron
| 140
| 156
| no data
| 125
| 102
| 126 a
|
| 27 | Co | cobalt
| 135
| 152
| no data
| 126
| 96
| 125 a
|
| 28 | Ni | nickel
| 135
| 149
| 163
| 121
| 101
| 124 a
|
| 29 | Cu | copper
| 135
| 145
| 140
| 138
| 120
| 128 a
|
| 30 | Zn | zinc
| 135
| 142
| 139
| 131
| no data
| 134 a
|
| 31 | Ga | gallium
| 130
| 136
| 187
| 126
| 121
| 135 b
|
| 32 | Ge | germanium
| 125
| 125
| no data
| 122
| 114
|
|
| 33 | As | arsenic
| 115
| 114
| 185
| 119
| 106
|
|
| 34 | Se | selenium
| 115
| 103
| 190
| 116
| 107
|
|
| 35 | Br | bromine
| 115
| 94
| 185
| 114
| 110
|
|
| 36 | Kr | krypton
| no data
| 88
| 202
| 110
| 108
|
|
| 37 | Rb | rubidium
| 235
| 265
| no data
| 211
| no data
| 248
|
| 38 | Sr | strontium
| 200
| 219
| no data
| 192
| 139
| 215
|
| 39 | Y | yttrium
| 180
| 212
| no data
| 162
| 124
| 180 a
|
| 40 | Zr | zirconium
| 155
| 206
| no data
| 148
| 121
| 160
|
| 41 | Nb | niobium
| 145
| 198
| no data
| 137
| 116
| 146 a
|
| 42 | Mo | molybdenum
| 145
| 190
| no data
| 145
| 113
| 139 a
|
| 43 | Tc | technetium
| 135
| 183
| no data
| 156
| 110
| 136 a
|
| 44 | Ru | ruthenium
| 130
| 178
| no data
| 126
| 103
| 134 a
|
| 45 | Rh | rhodium
| 135
| 173
| no data
| 135
| 106
| 134 a
|
| 46 | Pd | palladium
| 140
| 169
| 163
| 131
| 112
| 137 a
|
| 47 | Ag | silver
| 160
| 165
| 172
| 153
| 137
| 144 a
|
| 48 | Cd | cadmium
| 155
| 161
| 158
| 148
| no data
| 151 a
|
| 49 | In | indium
| 155
| 156
| 193
| 144
| 146
| 167
|
| 50 | Sn | tin
| 145
| 145
| 217
| 141
| 132
|
|
| 51 | Sb | antimony
| 145
| 133
| no data
| 138
| 127
|
|
| 52 | Te | tellurium
| 140
| 123
| 206
| 135
| 121
|
|
| 53 | I | iodine
| 140
| 115
| 198
| 133
| 125
|
|
| 54 | Xe | xenon
| no data
| 108
| 216
| 130
| 122
|
|
| 55 | Cs | caesium
| 260
| 298
| no data
| 225
| no data
| 265
|
| 56 | Ba | barium
| 215
| 253
| no data
| 198
| 149
| 222
|
| 57 | La | lanthanum
| 195
| no data
| no data
| 169
| 139
| 187 a
|
| 58 | Ce | cerium
| 185
| no data
| no data
| no data
| 131
| 181.8 b
|
| 59 | Pr | praseodymium
| 185
| 247
| no data
| no data
| 128
| 182.4 b
|
| 60 | Nd | neodymium
| 185
| 206
| no data
| no data
| no data
| 181.4 b
|
| 61 | Pm | promethium
| 185
| 205
| no data
| no data
| no data
| 183.4 b
|
| 62 | Sm | samarium
| 185
| 238
| no data
| no data
| no data
| 180.4 b
|
| 63 | Eu | europium
| 185
| 231
| no data
| no data
| no data
| 208.4 b
|
| 64 | Gd | gadolinium
| 180
| 233
| no data
| no data
| 132
| 180.4 b
|
| 65 | Tb | terbium
| 175
| 225
| no data
| no data
| no data
| 177.3 b
|
| 66 | Dy | dysprosium
| 175
| 228
| no data
| no data
| no data
| 178.1 b
|
| 67 | Ho | holmium
| 175
| no data
| no data
| no data
| no data
| 176.2 b
|
| 68 | Er | erbium
| 175
| 226
| no data
| no data
| no data
| 176.1 b
|
| 69 | Tm | thulium
| 175
| 222
| no data
| no data
| no data
| 175.9 b
|
| 70 | Yb | ytterbium
| 175
| 222
| no data
| no data
| no data
| 193.3 b
|
| 71 | Lu | lutetium
| 175
| 217
| no data
| 160
| 131
| 173.8 b
|
| 72 | Hf | hafnium
| 155
| 208
| no data
| 150
| 122
| 159
|
| 73 | Ta | tantalum
| 145
| 200
| no data
| 138
| 119
| 146 a
|
| 74 | W | tungsten
| 135
| 193
| no data
| 146
| 115
| 139 a
|
| 75 | Re | rhenium
| 135
| 188
| no data
| 159
| 110
| 137 a
|
| 76 | Os | osmium
| 130
| 185
| no data
| 128
| 109
| 135 a
|
| 77 | Ir | iridium
| 135
| 180
| no data
| 137
| 107
| 135.5 a
|
| 78 | Pt | platinum
| 135
| 177
| 175
| 128
| 110
| 138.5 a
|
| 79 | Au | gold
| 135
| 174
| 166
| 144
| 123
| 144 a
|
| 80 | Hg | mercury
| 150
| 171
| 155
| 149
| no data
| 151 a
|
| 81 | Tl | thallium
| 190
| 156
| 196
| 148
| 150
| 170
|
| 82 | Pb | lead
| 180
| 154
| 202
| 147
| 137
|
|
| 83 | Bi | bismuth
| 160
| 143
| no data
| 146
| 135
|
|
| 84 | Po | polonium
| 190
| 135
| no data
| no data
| 129
|
|
| 85 | At | astatine
| no data
| no data
| no data
| no data
| 138
|
|
| 86 | Rn | radon
| no data
| 120
| no data
| 145
| 133
|
|
| 87 | Fr | francium
| no data
| no data
| no data
| no data
| no data
| no data
|
| 88 | Ra | radium
| 215
| no data
| no data
| no data
| 159
| no data
|
| 89 | Ac | actinium
| 195
| no data
| no data
| no data
| 140
|
|
| 90 | Th | thorium
| 180
| no data
| no data
| no data
| 136
| 179 a
|
| 91 | Pa | protactinium
| 180
| no data
| no data
| no data
| 129
| 163 c
|
| 92 | U | uranium
| 175
| no data
| 186
| no data
| 118
| 156 d
|
| 93 | Np | neptunium
| 175
| no data
| no data
| no data
| 116
| 155 d
|
| 94 | Pu | plutonium
| 175
| no data
| no data
| no data
| no data
| 159 d
|
| 95 | Am | americium
| 175
| no data
| no data
| no data
| no data
| 173 a
|
| 96 | Cm | curium
| no data
| no data
| no data
| no data
| no data
| 174 a
|
| 97 | Bk | berkelium
| no data
| no data
| no data
| no data
| no data
| 170 a
|
| 98 | Cf | californium
| no data
| no data
| no data
| no data
| no data
| 186+/- 2 a
|
| 99 | Es | einsteinium
| no data
| no data
| no data
| no data
| no data
| 186+/- 2 a
|
| 100 | Fm | fermium
| no data
| no data
| no data
| no data
| no data
| no data
|
| 101 | Md | mendelevium
| no data
| no data
| no data
| no data
| no data
| no data
|
| 102 | No | nobelium
| no data
| no data
| no data
| no data
| no data
| no data
|
| 103 | Lr | lawrencium
| no data
| no data
| no data
| no data
| no data
| no data
|
| 104 | Rf | rutherfordium
| no data
| no data
| no data
| no data
| 131
| no data
|
| 105 | Db | dubnium
| no data
| no data
| no data
| no data
| 126
| no data
|
| 106 | Sg | seaborgium
| no data
| no data
| no data
| no data
| 121
| no data
|
| 107 | Bh | bohrium
| no data
| no data
| no data
| no data
| 119
| no data
|
| 108 | Hs | hassium
| no data
| no data
| no data
| no data
| 118
| no data
|
| 109 | Mt | meitnerium
| no data
| no data
| no data
| no data
| 113
| no data
|
| 110 | Ds | darmstadtium
| no data
| no data
| no data
| no data
| 112
| no data
|
| 111 | Rg | roentgenium
| no data
| no data
| no data
| no data
| 118
| no data
|
| 112 | Uub | ununbium
| no data
| no data
| no data
| no data
| 130
| no data
|
| 113 | Uut | ununtrium
| no data
| no data
| no data
| no data
| no data
| no data
|
| 114 | Uuq | ununquadium
| no data
| no data
| no data
| no data
| no data
| no data
|
| 115 | Uup | ununpentium
| no data
| no data
| no data
| no data
| no data
| no data
|
| 116 | Uuh | ununhexium
| no data
| no data
| no data
| no data
| no data
| no data
|
Notes
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. 1967, 47, 1300.
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.
Triple-Bond Covalent Radii
- P.Pyykkö, S. Riedel, M. Patzschke, Chem. Eur. J. 2005, 12, 3511 - 3520. Mean-square deviation 3pm.
- Triple-Bond Covalent Radii Table online: http://www.psichem.de/triple-bond/index.htm
Metallic radius
Greenwood, N. N.; Earnshaw, A. (1997). Chemistry of the Elements, 2nd Edition, Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4.
See also
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