1

H

1.008

2

He

4.0026

3

Li

6.9390

4

Be

9.0122

5

B

10.8110

6

C

12.0100

7

N

14.0060

8

O

16

9

F

19

10

Ne

20.1830

11

Na

22.9898

12

Mg

24.3120

13

Al

26.9815

14

Si

28.086

15

P

30.9738

16

S

32.0640

17

Cl

35.4530

18

Ar

39.948

19

K

39.1020

20

Ca

40.0800

21

Sc

44.9560

22

Ti

47.9000

23

V

50.9420

24

Cr

51.9960

25

Mn

54.9380

26

Fe

55.8470

27

Co

58.9332

28

Ni

58.7100

29

Cu

63.5400

30

Zn

65.3700

31

Ga

69.72

32

Ge

72.59

33

As

74.9216

34

Se

78.96

35

Br

79.909

36

Kr

83.80

37

Rb

85.5

38

Sr

87.6

39

Y

88.9

40

Zr

91.2

41

Nb

92.9

42

Mo

95

43

Tc

99

44

Ru

101.07

45

Rh

102.9

46

Pd

106.7

47

Ag

107.9

48

Cd

112.4

49

In

114.8

50

Sn

118.7

51

Sb

121.8

52

Te

127.6

53

I

126.9

54

Xe

131.3

55

Cs

132.91

56

Ba

137.34

57

La

138.92

72

Hf

178.49

73

Ta

180.95

74

W

183.65

75

Re

186.31

76

Os

190.2

77

Ir

192.2

78

Pt

195.09

79

Au

196.9

80

Hg

200.59

81

Tl

204.39

82

Pb

207.19

83

Bi

209

84

Po

242

85

At

210

86

Rn

222

87

Fr

223

88

Ra

226

89

Ac

227

58

Ce

140.1200

59

Pr

140.9200

60

Nd

144.2400

61

Pm

145.0000

62

Sm

150.3500

63

Eu

151.9600

64

Gd

157.2500

65

Tb

158.9200

66

Dy

162.5000

67

Ho

164.9400

68

Er

167.2600

69

Tm

169.4000

70

Yb

173.0400

71

Lu

174.9900

90

Th

232.0380

91

Pa

231

92

U

238.03

93

Np

227

94

Pu

242

95

Am

243

96

Cm

245

97

Bk

249

98

Cf

249

99

Es

254

100

Fm

252

101

Md

256

102

No

254

103

Lw