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Empirically measured atomic radii

The following table shows empirically measured covalent radii for the elements, as published by J. C. Slater in 1964.<ref name="slater64"> Template:Cite journal</ref> The values are in picometers (pm or 1×10⁻¹² m,), 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