Empirically Measured Atomic Radii
The following table shows empirically measured covalent radii for the elements, as published by J. C. Slater in 1964. The values are in picometers (pm), with an accuracy of about 5 pm. The shade of the box ranges from red to yellow as the radius increases; gray indicates lack of data.
| Group (vertical) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | |
| Period (horizontal) | |||||||||||||||||||
| 1 | H 25 |
He |
|||||||||||||||||
| 2 | Li 145 |
Be 105 |
B 85 |
C 70 |
N 65 |
O 60 |
F 50 |
Ne |
|||||||||||
| 3 | Na 180 |
Mg 150 |
Al 125 |
Si 110 |
P 100 |
S 100 |
Cl 100 |
Ar |
|||||||||||
| 4 | K 220 |
Ca 180 |
Sc 160 |
Ti 140 |
V 135 |
Cr 140 |
Mn 140 |
Fe 140 |
Co 135 |
Ni 135 |
Cu 135 |
Zn 135 |
Ga 130 |
Ge 125 |
As 115 |
Se 115 |
Br 115 |
Kr |
|
| 5 | Rb 235 |
Sr 200 |
Y 180 |
Zr 155 |
Nb 145 |
Mo 145 |
Tc 135 |
Ru 130 |
Rh 135 |
Pd 140 |
Ag 160 |
Cd 155 |
In 155 |
Sn 145 |
Sb 145 |
Te 140 |
I 140 |
Xe |
|
| 6 | Cs 260 |
Ba 215 |
* |
Hf 155 |
Ta 145 |
W 135 |
Re 135 |
Os 130 |
Ir 135 |
Pt 135 |
Au 135 |
Hg 150 |
Tl 190 |
Pb 180 |
Bi 160 |
Po 190 |
At |
Rn |
|
| 7 | Fr |
Ra 215 |
** |
Rf |
Db |
Sg |
Bh |
Hs |
Mt |
Ds |
Rg |
Cn |
Uut |
Fl |
Uup |
Lv |
Uus |
Uuo |
|
| Lanthanides | * |
La 195 |
Ce 185 |
Pr 185 |
Nd 185 |
Pm 185 |
Sm 185 |
Eu 185 |
Gd 180 |
Tb 175 |
Dy 175 |
Ho 175 |
Er 175 |
Tm 175 |
Yb 175 |
Lu 175 |
|||
| Actinides | ** |
Ac 195 |
Th 180 |
Pa 180 |
U 175 |
Np 175 |
Pu 175 |
Am 175 |
Cm |
Bk |
Cf |
Es |
Fm |
Md |
No |
Lr |
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Read more about this topic: Atomic Radius
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—Sinclair Lewis (1885–1951)
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—J. Robert Oppenheimer (1904–1967)