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Periodic Table of the Elements
14
Atomic number
Si
Symbol
Group 1 IA
Atomic mass
Silicon
1
1
H
3
4
9
5
6
7
Name
2
He
Hydrogen
2 IIA
13 IIIA
14 IVA
15 VA
16 VIA
17 VIIA
3
4
5
6
7
8
9
10
Li
Be
B
C
N
O
F
Ne
1.008
2
18 VIIIA
28.086
4.0026 Helium
6.941
9.012
10.81
12.011
14.007
15.999
18.998
20.179
Lithium
Beryllium
Boron
Carbon
Nitrogen
Oxygen
Fluorine
Neon
11
12
13
14
15
16
17
18
Na
Mg
Al
Si
P
S
Cl
Ar
22.990
24.305 Magnesium
3 IIIB
4 IVB
5 VB
6 VIB
7 VIIB
8
Sodium
19
20
21
22
23
24
25
26
9 VIII
10
27
28
11 IB
12 IIB
26.982
28.086
30.974
32.066
35.453
39.948
Aluminum
Silicon
Phosphorus
Sulfur
Chlorine
Argon
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
39.098
40.08
44.956
47.88
50.942
51.996
54.938
55.847
58.933
58.69
63.546
65.39
69.72
72.61
74.922
78.96
79.904
83.80
Potassium
Calcium
Scandium
Titanium
Vanadium
Chromium
Manganese
Iron
Cobalt
Nickel
Copper
Zinc
Gallium
Germanium
Arsenic
Selenium
Bromine
Krypton
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
95.94
(98)
101.07
102.906
85.468
87.62
88.906
91.224
92.906
Rubidium
Strontium
Yttrium
Zirconium
Niobium
55
56
57
72
73
74
75
76
Cs
Ba
La
Hf
Ta
W
Re
132.905
137.33
138.906
Cesium
Barium
Lanthanum
Molybdenum Technetium
106.42
107.868
112.41
114.82
118.71
121.763
127.60
126.904
131.29
Palladium
Silver
Cadmium
Indium
Tin
Antimony
Tellurium
Iodine
Xenon
77
78
79
80
81
82
83
84
85
86
Os
Ir
Pt
Au
Hg
Tl
Pb
Bi
Po
At
Rn
195.08
196.967
200.59
204.383
207.2
208.980
(209)
(210)
(222)
Platinum
Gold
Mercury
Thallium
Lead
Bismuth
Polonium
Astatine
Radon
Ruthenium
Rhodium
178.49
180.948
183.84
186.207
190.23
192.22
Hafnium
Tantalum
Tungsten
Rhenium
Osmium
Iridium
87
88
89
104
105
106
107
108
109
Fr
Ra
Ac
Rf
Db
Sg
Bh
Hs
Mt
(223)
226.025
Francium
Radium
(261)
(262)
(263)
(262)
(265)
(266)
Rutherfordium
Dubnium
Seaborgium
Bohrium
Hassium
Meitnerium
227.028 Actinium
Lanthanide Series
Mass numbers in parentheses are those of the most stable or most common isotope.
(269)
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
140.908
144.24
(145)
140.12 Cerium
Actinide Series
110
Praseodymium Neodymium Promethium
150.36
151.97
157.25
158.925
162.50
164.930
167.26
168.934
173.04
174.967
Samarium
Europium
Gadolinium
Terbium
Dysprosium
Holmium
Erbium
Thulium
Ytterbium
Lutetium
103
90
91
92
93
94
95
96
97
98
99
100
101
102
Th
Pa
U
Np
Pu
Am
Cm
Bk
Cf
Es
Fm
Md
No
Lr
232.038
231.036
238.029
237.048
(244)
(243)
(247)
(247)
(251)
(252)
(257)
(258)
(259)
(262)
Thorium
Protactinium
Uranium
Neptunium
Plutonium
Americium
Curium
Berkelium
Californium
Einsteinium
Fermium
Mendelevium
Nobelium
Lawrencium
Revised October 15, 2001
