Periodic Table of the Elements

Group:
Period

1
H
1.01

Hydrogen

←Atomic number
←Element symbol
←Atomic mass (see notes)
←Element name

s-block

p-block (metals)

p-block (non-metals)

d-block

f-block

2
He
4.00

Helium

3
Li
6.94

Lithium

4
Be
9.01

Beryllium

5
B
10.81

Boron

6
C
12.01

Carbon

7
N
14.01

Nitrogen

8
O
16.00

Oxygen

9
F
19.00

Fluorine

10
Ne
20.18

Neon

11
Na
22.99

Sodium

12
Mg
24.31

Magnesium

13
Al
26.98

Aluminium

14
Si
28.09

Silicon

15
P
30.97

Phosphorus

16
S
32.07

Sulfur

17
Cl
35.45

Chlorine

18
Ar
39.95

Argon

19
K
39.10

Potassium

20
Ca
40.08

Calcium

21
Sc
44.96

Scandium

22
Ti
47.87

Titanium

23
V
50.94

Vanadium

24
Cr
52.00

Chromium

25
Mn
54.94

Manganese

26
Fe
55.85

Iron

27
Co
58.93

Cobalt

28
Ni
58.69

Nickel

29
Cu
63.55

Copper

30
Zn
65.41

Zinc

31
Ga
69.72

Gallium

32
Ge
72.64

Germanium

33
As
74.92

Arsenic

34
Se
78.96

Selenium

35
Br
79.90

Bromine

36
Kr
83.80

Krypton

37
Rb
85.47

Rubidium

38
Sr
87.62

Strontium

39
Y
88.91

Yttrium

40
Zr
91.22

Zirconium

41
Nb
92.91

Niobium

42
Mo
95.94

Molybdenum

43
Tc
(98)

Technetium

44
Ru
101.07

Ruthenium

45
Rh
102.91

Rhodium

46
Pd
106.42

Palladium

47
Ag
107.87

Silver

48
Cd
112.41

Cadmium

49
In
114.82

Indium

50
Sn
118.71

Tin

51
Sb
121.76

Antimony

52
Te
127.60

Tellurium

53
I
126.90

Iodine

54
Xe
131.29

Xenon

55
Cs
132.91

Caesium

56
Ba
137.33

Barium

57
La
138.91

Lanthanum

72
Hf
178.49

Hafnium

73
Ta
180.95

Tantalum

74
W
183.84

Tungsten

75
Re
186.21

Rhenium

76
Os
190.23

Osmium

77
Ir
192.22

Iridium

78
Pt
195.08

Platinum

79
Au
196.97

Gold

80
Hg
200.59

Mercury

81
Tl
204.38

Thallium

82
Pb
207.20

Lead

83
Bi
208.98

Bismuth

84
Po
(209)

Polonium

85
At
(210)

Astatine

86
Rn
(222)

Radon

87
Fr
(223)

Francium

88
Ra
(226)

Radium

89
Ac
(227)

Actinium

104
Rf
(261)

Rutherfordium

105
Db
(262)

Dubnium

106
Sg
(266)

Seaborgium

107
Bh
(264)

Bohrium

108
Hs
(277)

Hassium

109
Mt
(268)

Meitnerium

110
Ds
(281)

Darmstadtium

111
Rg
(272)

Roentgenium

112
Uub
(285)

Ununbium

113
Uut
(284)

Ununtrium

114
Uuq
(289)

Ununquadium

115
Uup
(288)

Ununpentium

Lanthanide Series

58
Ce
140.12

Cerium

59
Pr
140.91

Praseodymium

60
Nd
144.24

Neodymium

61
Pm
(145)

Promethium

62
Sm
150.36

Samarium

63
Eu
151.97

Europium

64
Gd
157.25

Gadolinium

65
Tb
158.93

Terbium

66
Dy
162.50

Dysprosium

67
Ho
164.93

Holmium

68
Er
167.26

Erbium

69
Tm
168.93

Thulium

70
Yb
173.04

Ytterbium

71
Lu
174.97

Lutetium

Actinide Series

90
Th
(232.04)

Thorium

91
Pa
(231.04)

Protactinium

92
U
(238.03)

Uranium

93
Np
237

Neptunium

94
Pu
(244)

Plutonium

95
Am
(243)

Americium

96
Cm
(247)

Curium

97
Bk
(247)

Berkelium

98
Cf
(251)

Californium

99
Es
(252)

Einsteinium

100
Fm
(257)

Fermium

101
Md
(258)

Mendelevium

102
No
(259)

Nobelium

103
Lr
(262)

Lawrencium

The information in this table follows the IUPAC Nomenclature of Inorganic Chemistry Recommendations, 2001 (http://www.chem.qmul.ac.uk/iupac/AtWt/) (Pure Appl. Chem. 2003, 75, 1107-1122).
Elements with no stable nuclides have the mass number of their longest-lived isotope shown in brackets. Th, Pa and U have their masses in brackets because they have no stable nuclides; however there is an identifiable characterstic terrestrial isotopic composition, and this is given.
The elements B, Si, Ge, As, Sb, Te, Po and At are classified as metalloids. These are sometimes demarcated in periodic tables and sometimes not. Here, we chose not to mark them.
Every effort has been made to ensure accuracy, but perfection is impossible. Please report errors to sciResources@ibises.org.uk

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