Periodic Table Of The Elements
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1Metals
Group 18
1
H
Alkali metals
2
1
6
Atomic number
He
Hydrogen
Alkaline-earth metals
1.007 94
Transition metals
Helium
C
Symbol
4.002 602
Other metals
Key:
Group 1
Group 2
Group 13
Group 14
Group 15
Group 16
Group 17
Carbon
Name
3
4
Nonmetals
5
6
7
8
9
10
Li
Be
B
C
N
O
F
Ne
12.0107
Hydrogen
Average atomic mass
2
Boron
Carbon
Nitrogen
Oxygen
Fluorine
Neon
Lithium
Beryllium
Semiconductors
6.941
9.012 182
10.811
12.0107
14.006 74
15.9994
18.998 4032
20.1797
Halogens
Noble gases
11
12
13
14
15
16
17
18
Na
Mg
Other nonmetals
Al
Si
P
S
Cl
Ar
3
Aluminum
Silicon
Phosphorus
Sulfur
Chlorine
Argon
Sodium
Magnesium
22.989 770
24.3050
26.981 538
28.0855
30.973 761
32.066
35.4527
39.948
Group 3
Group 4
Group 5
Group 6
Group 7
Group 8
Group 9
Group 10
Group 11
Group 12
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
K
Ca
Sc
Ti
V
Cr
Mn
Fe
Co
Ni
Cu
Zn
Ga
Ge
As
Se
Br
Kr
4
Nickel
Copper
Zinc
Gallium
Germanium
Arsenic
Selenium
Bromine
Krypton
Potassium
Calcium
Scandium
Titanium
Vanadium
Chromium
Manganese
Iron
Cobalt
39.0983
40.078
44.955 910
47.867
50.9415
51.9961
54.938 049
55.845
58.933 200
58.6934
63.546
65.39
69.723
72.61
74.921 60
78.96
79.904
83.80
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
Rb
Sr
Y
Zr
Nb
Mo
Ru
Rh
Pd
Ag
Cd
In
Sn
Sb
Te
I
Xe
Tc
5
Rubidium
Strontium
Yttrium
Zirconium
Niobium
Molybdenum
Technetium
Ruthenium
Rhodium
Cadmium
Xenon
Palladium
Silver
Indium
Tin
Antimony
Tellurium
Iodine
85.4678
87.62
88.905 85
91.224
92.906 38
95.94
(98)
101.07
102.905 50
106.42
107.8682
114.818
118.710
121.760
127.60
126.904 47
112.411
131.29
55
56
57
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
Cs
Ba
La
Hf
Ta
W
Re
Os
Ir
Pt
Au
Hg
Tl
Pb
Bi
Po
At
Rn
6
Cesium
Barium
Lanthanum
Hafnium
Tantalum
Tungsten
Rhenium
Osmium
Iridium
Platinum
Gold
Mercury
Thallium
Lead
Bismuth
Polonium
Astatine
Radon
132.905 45
137.327
138.9055
178.49
180.9479
183.84
186.207
190.23
192.217
195.078
196.966 55
200.59
204.3833
207.2
208.980 38
(209)
(210)
(222)
108
87
88
89
104
105
106
107
109
110
111
112
114
Fr
Ra
Ac
Rf
Db
Sg
Bh
Hs
Mt
Uun*
Uuu*
Uub*
Uuq*
7
Francium
Radium
Actinium
Rutherfordium
Dubnium
Seaborgium
Bohrium
Hassium
Meitnerium
Ununnilium
Unununium
Ununbium
Ununquadium
†
†
(269) †
(272) †
(277) †
(223)
(226)
(227)
(261)
(262)
(263)
(264)
(265)
(268)
(285) †
A team at Lawrence Berkeley National reported the discovery of elements 116 and 118
in June 1999. The same team retracted the discovery in July 2001. The discovery of ele-
ment 114 has been reported but not confirmed.
†
Estimated from currently available
63
64
65
66
67
68
69
70
71
58
59
60
61
62
IUPAC data.
Eu
Gd
Tb
Dy
Ho
Er
Tm
Yb
Lu
Ce
Pr
Nd
Pm
Sm
Cerium
Praseodymium
Neodymium
Promethium
Samarium
* The systematic names and symbols
Europium
Gadolinium
Terbium
Dysprosium
Holmium
Erbium
Thulium
Ytterbium
Lutetium
for elements greater than 109 will
140.116
140.907 65
144.24
(145)
151.964
157.25
158.925 34
162.50
164.930 32
167.26
168.934 21
173.04
174.967
150.36
be used until the approval of trivial
names by IUPAC.
90
91
92
93
94
95
96
97
98
99
100
101
102
103
Th
Pa
U
Np
Pu
Am
Cm
Bk
Cf
Es
Fm
Md
No
Lr
Thorium
Protactinium
Uranium
Neptunium
Plutonium
Americium
Curium
Berkelium
Californium
Einsteinium
Fermium
Mendelevium
Nobelium
Lawrencium
232.0381
231.035 88
238.0289
(237)
(244)
(243)
(247)
(247)
(251)
(252)
(257)
(258)
(259)
(262)
The atomic masses listed in this table reflect the precision of current measurements. (Values listed in
parentheses are those of the element’s most stable or most common isotope.) In calculations throughout
the text, however, atomic masses have been rounded to two places to the right of the decimal.
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