Atomic Radius - Empirically Measured Atomic Radii

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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