1
H
1.008

2
He
4.003

3
Li
6.941

4
Be
9.012

mass #

5
B
10.81

6
C
12.01

7
N
14.01

8
O
16.00

9
F
19.00

10
Ne
20.18

19
K
39.10

20
Ca
40.08

21
Sc
44.96

22
Ti
47.88

23
V
50.94

24
Cr
52.00

25
Mn
54.94

26
Fe
55.85

27
Co
58.47

28
Ni
58.69

29
Cu
63.55

30
Zn
65.39

31
Ga
69.72

32
Ge
72.59

33
As
74.92

34
Se
78.96

35
Br
79.90

36
Kr
83.80

37
Rb
85.47

38
Sr
87.62

39
Y
88.91

40
Zr
91.22

41
Nb
92.91

42
Mo
95.94

43
Tc
(98)

44
Ru
101.1

45
Rh
102.9

46
Pd
106.4

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
132.9

56
Ba
137.3

57
La*
138.9

72
Hf
178.5

73
Ta
180.9

74
W
183.9

75
Re
186.2

76
Os
190.2

77
Ir
190.2

78
Pt
195.1

79
Au
197.0

80
Hg
200.5

81
Tl
204.4

82
Pb
207.2

83
Bi
209.0

84
Po
(210)

85
At
(210)

86
Rn
(222)

87
Fr
(223)

88
Ra
(226)

89
Ac~
(227)

104
Rf
(257)

105
Db
(260)

106
Sg
(263)

107
Bh
(262)

108
Hs
(265)

109
Mt
(266)

110
---
()

111
---
()

112
---
()

114
---
()

116
---
()

118
---
()

58
Ce
140.1

59
Pr
140.9

60
Nd
144.2

61
Pm
(147)

62
Sm
150.4

63
Eu
152.0

64
Gd
157.3

65
Tb
158.9

66
Dy
162.5

67
Ho
164.9

68
Er
167.3

69
Tm 168.9

70
Yb
173.0

71
Lu
175.0

90
Th
232.0

91
Pa
(231)

92
U
(238)

93
Np
(237)

94
Pu
(242)

95
Am
(243)

96
Cm
(247)

97
Bk
(247)

98
Cf
(249)

99
Es
(254)

100
Fm
(253)

101
Md
(256)

102
No
(254)

103
Lr
(257)