Periodic Table of the Elements

1
H
Hydrogen
1.007 94

Atomic Number		6 C Carbon 12.0107
Symbol
Name
Average Atomic Mass

Group 18

Group 2

Group 13

Group 14

Group 15

Group 16

Group 17

2
He
Helium
4.002 602

Group 1

3
Li
Lithium
6.941

4
Be
Beryllium
9.012 182

5
B
Boron
10.811

6
C
Carbon
12.0107

7
N
Nitrogen
14.0067

8
O
Oxygen
15.9994

9
F
Fluorine
18.998 4032

10
Ne
Neon
20.1797

11
Na
Sodium
22.989 769 28

12
Mg
Magnesium
24.3050

13
Al
Aluminum
26.981 5386

14
Si
Silicon
28.0855

15
P
Phosphorus
30.973 762

16
S
Sulfur
32.065

17
Cl
Chlorine
35.453

18
Ar
Argon
39.948

Group 3

Group 4

Group 5

Group 6

Group 7

Group 8

Group 9

Group 10

Group 11

Group 12

19
K
Potassium
39.0983

20
Ca
Calcium
40.078

21
Sc
Scandium
44.955 912

22
Ti
Titanium
47.867

23
V
Vanadium
50.9415

24
Cr
Chromium
51.9961

25
Mn
Manganese
54.938 045

26
Fe
Iron
55.845

27
Co
Cobalt
58.933 195

28
Ni
Nickel
58.6934

29
Cu
Copper
63.546

30
Zn
Zinc
65.38

31
Ga
Gallium
69.723

32
Ge
Germanium
72.64

33
As
Arsenic
74.921 60

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
88.905 85

40
Zr
Zirconium
91.224

41
Nb
Niobium
92.906 38

42
Mo
Molybdenum
95.96

43
Tc
Technetium
(98)

44
Ru
Ruthenium
101.07

45
Rh
Rhodium
102.905 50

46
Pd
Palladium
106.42

47
Ag
Silver
107.8682

48
Cd
Cadmium
112.411

49
In
Indium
114.818

50
Sn
Tin
118.710

51
Sb
Antimony
121.760

52
Te
Tellurium
127.60

53
I
Iodine
126.904 47

54
Xe
Xenon
131.293

55
Cs
Cesium
132.905 4519

56
Ba
Barium
137.327

57
La
Lanthanum
138.905 47

72
Hf
Hafnium
178.49

73
Ta
Tantalum
180.947 88

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
196.966 569

80
Hg
Mercury
200.59

81
Tl
Thallium
204.3833

82
Pb
Lead
207.2

83
Bi
Bismuth
208.980 40

84
Po ^‡
Polonium
(209)

85
At ^‡
Astatine
(210)

86
Rn
Radon
(222)

87
Fr
Francium
(223)

88
Ra
Radium
(226)

89
Ac
Actinium
(227)

104
Rf
Rutherfordium
(261)

105
Db
Dubnium
(262)

106
Sg
Seaborgium
(266)

107
Bh
Bohrium
(264)

108
Hs
Hassium
(277)

109
Mt
Meitnerium
(268)

110
Ds
Darmstadtium
(271)

111
Rg
Roentgenium
(272)

112
Uub*
Ununbium
(285)

113
Uut*
Ununtrium
(284)

114
Uuq*
Ununquadium
(289)

115
Uup*
Ununpentium
(288)

116
Uuh*
Ununhexium
(292)

118
Uuo*
Ununoctium
(294)

The systematic names and symbols for elements greater than 111 will be used until the approval of trivial names by the IUPAC.

For a discussion on why Po and At are not considered metalloids in this table, click here.

The discoveries of elements with atomic numbers 112 through 116 and 118 have been reported but not fully confirmed.

58
Ce
Cerium
140.116

59
Pr
Praseodymium
140.907 65

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
158.925 35

66
Dy
Dysprosium
162.500

67
Ho
Holmium
164.930 32

68
Er
Erbium
167.259

69
Tm
Thulium
168.934 21

70
Yb
Ytterbium
173.054

71
Lu
Lutetium
174.9668

90
Th
Thorium
232.038 06

91
Pa
Protactinium
231.035 88

92
U
Uranium
238.028 91

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
(252)

100
Fm
Fermium
(257)

101
Md
Mendelevium
(258)

102
No
Nobelium
(259)

103
Lr
Lawrencium
(262)

The atomic masses listed in this table reflect the precision of current measurements. (Each value listed in parentheses is the mass number of that radioactive element's most stable or most common isotope.)