Physical Constants

Recommended values of selected physical constants0

Constant

Symbol

Value

acceleration of free fall (acceleration

gn

9.80665 ms-2b

due to gravity)

atomic mass constant (unified atomic

mu

1.6605402(10) x 10-27 kg

mass unit)

Avogadro constant

L,Na

6.0221367(36) x1023 mol-1

Boltzmann constant

kb

1.380658(12) x10-23 JK-1

electron specific charge

-e/me

-1.758 819 x 1011 Ckg-1

(charge-to-mass ratio)

electron charge (elementary charge)

e

1.602177 33(49) x10-19 C

Faraday constant

F

9.6485309(29) x104 Cmol-1

ice-point temperature

1 ice

273.15 Kb

molar gas constant

R

8.314510(70) JK-1 mol-1

molar volume of ideal gas (at

Vm

22.41410(19) x10-3 m3 mol-1

273.15 K and 101 325 Pa)

Planck constant

h

6.6260755(40) x10-34 Js

standard atmosphere

atm

101325 Pab

speed of light in vacuum

c

2.997 924 58 x108 ms-1 b

a Data are presented in their full precision, although often no more than the first four or five significant digits are used; figures in parentheses represent the standard deviation uncertainty in the least significant digits. bExactly defined values.

a Data are presented in their full precision, although often no more than the first four or five significant digits are used; figures in parentheses represent the standard deviation uncertainty in the least significant digits. bExactly defined values.

The Periodic Table

— Pauling electronegativity Atomic number Element

Atomic weight(12C)

Group 1

6.941

22.990

39.102

85.47

132.91

Group 2

24.305

40.08

87.62

137.34

Group :

- d transition elements -

Group 13 Group 14 Group 15 Group 16 Group 17 Group 18

Group :

- d transition elements -

21

22

23

24

25

26

27

28

29

30

Sc

Ti

V

Cr

Mn

Fe

Co

Ni

Cu

Zn

44.956

47.90

50.941

51.996

54.938

55.847

58.933

58.71

63.546

65.37

39

40

41

42

43

44

45

46

47

48

Y

Zr

Nb

Mo

Tc

Ru

Rh

Pd

Ag

Cd

88.906

91.22

92.906

95.94

(99)

101.07

102.91

106.4

107.87

112.40

57

72

73

74

75

76

77

78

79

80

La

Hf

Ta

W

Re

Os

lr

Pt

Au

Hg

138.91

178.49

180.95

183.85

186.2

190.2

192.22

195.09

196.97

200.59

89

104

105

106

107

108

109

110

111

112

Ac

Rf

Db

Sg

Bh

Hs

Mt

Uun

Uuu

Unb

227.0

(261)

(262)

(263)

114.82

81 2.04 Ti

204.37

10.811

26.98

69.72

114.82

81 2.04 Ti

204.37

12.011

28.086

72.59

118.69

82 2.32 Pb

207.19

14.007

30.974

33 2.18 As

74.922

51 2.05 Sb

121.75

83 2.02 Bi

208.98

30.974

33 2.18 As

74.922

51 2.05 Sb

121.75

83 2.02 Bi

208.98

8

3 44

O

15.99

9

16

?58

S

32.064

34

P 55

Se

78.96

52

? 10

Te

127.6

0

84

Po

(210)

79.909

35.453

79.909

58

59

60

61

62

63

64

65

66

67

68

69

70

71

Ce

Pr

Nd

Pm

Sm

Eu

Gd

Tb

Dy

Ho

Er

Tm

Yb

Lu

140.12

140.91

144.24

(147)

150.35

151.96

157.25

158.92

162.50

164.93

167.26

168.93

173.04

174.97

90

91

92

93

94

95

96

97

98

99

100

101

102

103

Th

Pa

U

Np

Pu

Am

Cm

Bk

Cf

Es

Fm

Md

No

Lw

232.04

(231)

238.03

(237)

(242)

(243)

(247)

(247)

(249)

(254)

(253)

(253)

(256)

(260)

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