|
{glossarbot=disable}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
|
Notes:
References:
As quoted at http://www.webelements.com/ from these sources:
a) Atomic radius (empirical)-
b) Atomic radius (calculated)-
-
E. Clementi, D.L.Raimondi, and W.P. Reinhardt, J. Chem. Phys. 1963, 38, 2686.
c) Van der Waals radius-
-
A. Bondi, J. Phys. Chem., 1964, 68, 441.
d) 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.
|
