Periodic Table
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1Hydrogen
Group 18
1
Semiconductors
H
2
(also known as metalloids)
Key:
1
He
Hydrogen
1.008
Helium
Metals
1
1s
4.002 602
13
Atomic number
Alkali metals
2
1s
Group 1
Group 2
Group 13
Group 14
Group 15
Group 16
Group 17
Al
Alkaline-earth metals
Symbol
3
4
5
6
7
8
9
10
Transition metals
Li
Be
B
C
N
O
F
Ne
Aluminum
Name
Other metals
2
Lithium
Beryllium
Boron
Carbon
Nitrogen
Oxygen
Fluorine
Neon
26.981 5386
Average atomic mass
Nonmetals
6.94
9.012 182
10.81
12.01 1
14.007
15.999
18.998 4032
20.1797
[Ne]3s
2
3p
1
1
2
2
1
2
2
2
3
2
4
2
5
2
6
[He]2s
[He]2s
Electron configuration
[He]2s
2p
[He]2s
2p
[He]2s
2p
[He]2s
2p
[He]2s
2p
[He]2s
2p
Halogens
Noble gases
11
12
13
14
15
16
17
18
Other nonmetals
Na
Mg
Al
Si
P
S
Cl
Ar
3
Sodium
Magnesium
Aluminum
Silicon
Phosphorus
Sulfur
Chlorine
Argon
22.989 769 28
24.3050
26.981 5386
28.085
30.973 762
32.06
35.45
39.948
1
2
[Ne]3s
[Ne]3s
[Ne]3s
2
3p
1
[Ne]3s
2
3p
2
[Ne]3s
2
3p
3
[Ne]3s
2
3p
4
[Ne]3s
2
3p
5
[Ne]3s
2
3p
6
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
Potassium
Calcium
Scandium
Titanium
Vanadium
Chromium
Manganese
Iron
Cobalt
Nickel
Copper
Zinc
Gallium
Germanium
Arsenic
Selenium
Bromine
Krypton
39.0983
40.078
44.955 912
47.867
50.9415
51.9961
54.938 045
55.845
58.933 195
58.6934
63.546
65.409
69.723
72.63
74.921 60
78.96
79.904
83.798
1
2
1
2
2
2
3
2
5
1
5
2
6
2
7
2
[Ar]4s
[Ar]4s
[Ar]3d
4s
[Ar]3d
4s
[Ar]3d
4s
[Ar]3d
4s
[Ar]3d
4s
[Ar]3d
4s
[Ar]3d
4s
[Ar]3d
8
4s
2
[Ar]3d
10
4s
1
[Ar]3d
10
4s
2
[Ar]3d
10
4s
2
4p
1
[Ar]3d
10
4s
2
4p
2
[Ar]3d
10
4s
2
4p
3
[Ar]3d
10
4s
2
4p
4
[Ar]3d
10
4s
2
4p
5
[Ar]3d
10
4s
2
4p
6
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
Rb
Sr
Y
Zr
Nb
Mo
Tc
Ru
Rh
Pd
Ag
Cd
In
Sn
Sb
Te
I
Xe
5
Rubidium
Strontium
Yttrium
Zirconium
Niobium
Molybdenum
Technetium
Ruthenium
Rhodium
Palladium
Silver
Cadmium
Indium
Tin
Antimony
Tellurium
Iodine
Xenon
85.4678
87.62
88.905 85
91.224
92.906 38
95.94
(98)
101.07
102.905 50
106.42
107.8682
112.411
114.818
118.710
121.760
127.60
126.904 47
131.293
1
2
1
2
2
2
4
1
5
1
6
1
7
1
8
1
[Kr]5s
[Kr]5s
[Kr]4d
5s
[Kr]4d
5s
[Kr]4d
5s
[Kr]4d
5s
[Kr]4d
5s
[Kr]4d
5s
[Kr]4d
5s
[Kr]4d
10
[Kr]4d
10
5s
1
[Kr]4d
10
5s
2
[Kr]4d
10
5s
2
5p
1
[Kr]4d
10
5s
2
5p
2
[Kr]4d
10
5s
2
5p
3
[Kr]4d
10
5s
2
5p
4
[Kr]4d
10
5s
2
5p
5
[Kr]4d
10
5s
2
5p
6
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 4519
137.327
138.905 47
178.49
180.947 88
183.84
186.207
190.23
192.217
195.084
196.966 569
200.59
204.38
207.2
208.980 40
(209)
(210)
(222)
1
2
1
2
14
2
2
14
3
2
14
4
2
14
5
2
14
6
2
14
7
2
[Xe]6s
[Xe]6s
[Xe]5d
6s
[Xe]4 f
5d
6s
[Xe]4f
5d
6s
[Xe]4f
5d
6s
[Xe]4f
5d
6s
[Xe]4f
5d
6s
[Xe]4f
5d
6s
[Xe]4f
14
5d
9
6s
1
[Xe]4f
14
5d
10
6s
1
[Xe]4f
14
5d
10
6s
2
[Xe]4f
14
5d
10
6s
2
6p
1
[Xe]4f
14
5d
10
6s
2
6p
2
[Xe]4f
14
5d
10
6s
2
6p
3
[Xe]4f
14
5d
10
6s
2
6p
4
[Xe]4f
14
5d
10
6s
2
6p
5
[Xe]4f
14
5d
10
6s
2
6p
6
87
88
89
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
Cn
Fr
Ra
Ac
Rf
Db
Sg
Bh
Hs
Mt
Ds
Rg
Uut
*
Uuq
*
Uup
*
Uuh
*
Uus
*
Uuo
*
7
Francium
Radium
Actinium
Rutherfordium
Dubnium
Seaborgium
Bohrium
Meitnerium
Darmstadtium
Roentgenium
Copernicium
Ununtrium
Ununquadium
Ununpentium
Ununhexium
Ununseptium
Ununoctium
Hassium
(271)
(272)
(285)
(284)
(289)
(288)
(292)
(294)
(294)
(223)
(226)
(227)
(261)
(262)
(266)
(264)
(277)
(268)
1
2
1
2
14
2
2
14
3
2
14
4
2
14
5
2
14
6
2
14
7
2
14
9
1
14
10
1
14
10
2
14
10
2
1
14
10
2
2
14
10
2
3
14
10
2
4
14
10
2
5
14
10
2
6
[Rn]7s
[Rn]7s
[Rn]6d
7s
[Rn]5 f
6d
7s
[Rn]5 f
6d
7s
[Rn]5f
6d
7s
[Rn]5 f
6d
7s
[Rn]5f
6d
7s
[Rn]5 f
6d
7s
[Rn]5f
6d
7s
[Rn]5f
6d
7s
[Rn]5f
6d
7s
[Rn]5f
6d
7s
7p
[Rn]5f
6d
7s
7p
[Rn]5f
6d
7s
7p
[Rn]5f
6d
7s
7p
[Rn]5f
6d
7s
7p
[Rn]5f
6d
7s
7p
The discoveries of elements with atomic numbers 113–118 have been reported but not fully confirmed.
*
The systematic names and symbols
for elements greater than 112 will
be used until the approval of trivial
names by IUPAC.
58
59
60
61
62
63
64
65
66
67
68
69
70
71
Ce
Pr
Nd
Pm
Sm
Eu
Gd
Tb
Dy
Ho
Er
Tm
Yb
Lu
Elements whose average atomic masses appear bolded
Europium
Gadolinium
Terbium
Dysprosium
Holmium
Erbium
Thulium
Ytterbium
Lutetium
and italicized are recognized by the International Union
Cerium
Praseodymium
Neodymium
Promethium
Samarium
140.116
140.907 65
144.242
(145)
150.36
151.964
157.25
158.925 35
162.500
164.930 32
167.259
168.934 21
173.04
174.967
of Pure and Applied Chemistry (IUPAC) to have several
1
1
2
3
2
4
2
5
2
6
2
[Xe]4 f
5d
6s
[Xe]4 f
6s
[Xe]4 f
6s
[Xe]4f
6s
[Xe]4 f
6s
[Xe]4f
7
6s
2
[Xe]4f
7
5d
1
6s
2
[Xe]4f
9
6s
2
[Xe]4f
10
6s
2
[Xe]4f
11
6s
2
[Xe]4f
12
6s
2
[Xe]4f
13
6s
2
[Xe]4f
14
6s
2
[Xe]4f
14
5d
1
6s
2
stable isotopes. Thus, the average atomic mass for
each of these elements is officially expressed as a
90
91
92
93
94
95
96
97
98
99
100
101
102
103
range of values. A range of values expresses that the
Th
Pa
U
Np
Pu
Am
Cm
Bk
Cf
Es
Fm
Md
No
Lr
average atomic mass of a sample of one of these
Thorium
Protactinium
Uranium
Neptunium
Plutonium
Americium
Curium
Berkelium
Californium
Einsteinium
Fermium
Mendelevium
Nobelium
Lawrencium
elements is not a constant in nature but varies
232.038 06
231.035 88
238.028 91
(237)
(244)
(243)
(247)
(247)
(251)
(252)
(257)
(258)
(259)
(262)
depending on the physical, chemical, and nuclear
2
2
2
1
2
3
1
2
4
1
2
6
2
7
2
7
1
2
9
2
10
2
11
2
12
2
13
2
14
2
14
1
2
[Rn]6d
7s
[Rn]5f
6d
7s
[Rn]5 f
6d
7s
[Rn]5 f
6d
7s
[Rn]5f
7s
[Rn]5f
7s
[Rn]5f
6d
7s
[Rn]5f
7s
[Rn]5f
7s
[Rn]5f
7s
[Rn]5f
7s
[Rn]5f
7s
[Rn]5f
7s
[Rn]5f
6d
7s
history of the material in which the sample is found.
However, the values in this table are appropriate for
everyday calculations. A value given in parentheses is
not an average atomic mass but is the mass number of
that element's most stable or most common isotope.
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