1

H

Hydrogen

1.00794

2

He

Helium

4.002602

3

Li

Lithium

6.941

4

Be

Beryllium

9.012182

5

B

Boron

10.811

6

C

Carbon

12.0107

7

N

Nitrogen

14.0067

8

O

Oxygen

15.9994

9

F

Fluorine

18.9984032

10

Ne

Neon

20.1797

11

Na

Sodium

22.98976928(2)

12

Mg

Magnesium

24.305

13

Al

Aluminium

26.9815386

14

Si

Silicon

28.0855

15

P

Phosphorus

30.973762

16

S

Sulfur

32.065

17

Cl

Chlorine

35.453

18

Ar

Argon

39.948

19

K

Potassium

39.0983

20

Ca

Calcium

40.078

21

Sc

Scandium

44.955912

22

Ti

Titanium

47.867

23

V

Vanadium

50.9415

24

Cr

Chromium

51.9961

25

Mn

Manganese

54.938045

26

Fe

Iron

55.845

27

Co

Cobalt

58.933195

28

Ni

Nickel

58.6934

29

Cu

Copper

53.546

30

Zn

Zinc

65.38

31

Ga

Gallium

69.723

32

Ge

Germanium

72.63

33

As

Arsenic

74.9216

34

Se

Selenium

78.96

35

Br

Bromine

79.904

36

Kr

Krypton

83.798

37

Rb

Rubidium

85.4678

38

Sr

Strontium

87.62

39

Y

Yttrium

88.90585

40

Zr

Zirconium

91.224

41

Nb

Niobium

92.90638

42

Mo

Molybdenum

95.96

43

Tc

Technetium

98

44

Ru

Ruthenium

101.07

45

Rh

Rhodium

102.9055

46

Pd

Palladium

106.42

47

Ag

Silver

107.8682

48

Cd

Cadmium

112.411

49

In

Indium

114.818

50

Sn

Tin

118.71

51

Sb

Antimony

121.76

52

Te

Tellurium

127.6

53

I

Iodine

126.90447

54

Xe

Xenon

131.293

55

Cs

Caesium

132.9054519(2)

56

Ba

Barium

137.327

57

La

Lanthanum

138.90547

58

Ce

Cerium

140.116

59

Pr

Praseodymium

140.90765

60

Nd

Neodymium

144.242

61

Pm

Promethium

(145)

62

Sm

Samarium

150.36

63

Eu

Europium

151.964

64

Gd

Gadolinium

157.25

65

Tb

Terbium

158.92535

66

Dy

Dysprosium

162.5

67

Ho

Holmium

164.93032

68

Er

Erbium

167.259

69

Tm

Thulium

168.93421

70

Yb

Ytterbium

173.054

71

Lu

Lutetium

174.9668

72

Hf

Hafnium

178.49

73

Ta

Tantalum

180.94788

74

W

Tungsten

183.84

75

Re

Rhenium

186.207

76

Os

Osmium

190.23

77

Ir

Iridium

192.217

78

Pt

Platinum

195.084

79

Au

Gold

196.966569

80

Hg

Mercury

200.59

81

Tl

Thallium

204.3833

82

Pb

Lead

207.2

83

Bi

Bismuth

208.9804

84

Po

Polonium

(209)

85

At

Astatine

(210)

86

Rn

Radon

(222)

87

Fr

Francium

(223)

88

Ra

Radium

(226)

89

Ac

Actinium

(227)

90

Th

Thorium

232.03806

91

Pa

Protactinium

231.03588

92

U

Uranium

238.02891

93

Np

Neptunium

(237)

94

PU

Plutonium

(244)

95

Am

Americium

(243)

96

Cm

Curium

(247)

97

Bk

Berkelium

(247)

98

Cf

Californium

(251)

99

Es

Einsteinium

(251)

100

Fm

Fermium

(252)

101

Md

Mendelevium

(258)

102

No

Nobelium

(259)

103

Lr

Lawrencium

(262)

104

Rf

Rutherfordium

(267)

105

Db

Dubnium

(268)

106

Sg

Seaborgium

(271)

107

Bh

Bohrium

(272)

108

Hs

Hassium

(270)

109

Mt

Meitnerium

(276)

110

Ds

Damstadium

(281)

111

Rg

Roentgenium

(280)

112

Cn

Copernicium

(285)

113

Uut

Ununtrium

(284)

114

Fl

Flerovium

(289)

115

Uup

Ununpentium

(288)

116

Lv

Livermorium

(293)

117

UUs

Ununseptium

(294)

118

Uuo

Ununoctium

(294)