tag rule

Atomic Radii of the Elements from READE

{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:

  • The radius of an atom is not a uniquely defined property and depends on the definition. Data derived from other sources with different assumptions cannot be compared.

  • † to an accuracy of about 5 pm

References:

As quoted at http://www.webelements.com/ from these sources:

a) Atomic radius (empirical)-

  • J.C. Slater, J. Chem. Phys. 1964, 39, 3199.

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.