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18
8A
1
1A
1
1
H
Hydrogen
2
2A
3
4
1.008
2
3
4
6
7
14
Symbol
Si
Atomic mass
2
28.086
He
13
3A
14
4A
15
5A
16
6A
17
7A
Helium
5
6
7
8
9
10
4.003
Li
Be
B
C
N
O
F
Ne
6.941
9.012
10.812
12.011
14.007
15.999
18.998
20.180
Lithium
Beryllium
Boron
Carbon
Nitrogen
Oxygen
Fluorine
Neon
11
12
13
14
15
16
17
Na
Silicon
Mg
22.990
24.305
Magnesium
3
3B
4
4B
5
5B
6
6B
7
7B
8
Sodium
19
20
21
22
23
24
25
26
K
Ca
Sc
Ti
V
Cr
Name
9
8B
10
27
28
Al
Si
P
S
18
Cl
Ar
11
1B
12
2B
26.982
28.086
35.453
39.948
Silicon
30.974
32.066
Aluminum
Phosphorus
Sulfur
Chlorine
Argon
29
30
31
32
33
34
35
Mn
Fe
Co
Ni
Cu
Zn
Ga
Ge
As
Se
Br
36
Kr
39.098
40.078
44.956
47.867
50.942
51.996
54.938
55.845
58.933
58.693
63.546
65.38
69.723
72.64
74.922
78.96
79.904
83.798
Potassium
Calcium
Scandium
Titanium
Vanadium
Chromium
Manganese
Iron
Cobalt
Nickel
Copper
Zinc
Gallium
Germanium
Arsenic
Selenium
Bromine
Krypton
38
39
52
53
I
Xe
37
5
Atomic number
Rb
Sr
Y
40
Zr
41
Nb
85.468
87.62
88.906
91.224
92.906
Rubidium
Strontium
Yttrium
Zirconium
Niobium
55
56
71
72
73
42
43
Mo
Tc
95.96
(98)
Molybdenum Technetium
74
75
44
Ru
45
Rh
46
47
Pd
Ag
48
49
50
Cd
In
Sn
51
Sb
Te
54
101.07
102.906
106.42
107.868
112.412
114.818
118.711
121.760
127.60
126.904
131.294
Ruthenium
Rhodium
Palladium
Silver
Cadmium
Indium
Tin
Antimony
Tellurium
Iodine
Xenon
76
77
78
79
80
81
82
83
84
85
86
Cs
Ba
Lu
Hf
Ta
W
Re
Os
Ir
Pt
Au
Hg
Tl
Pb
Bi
Po
At
Rn
132.905
137.328
174.967
178.49
180.948
183.84
186.207
204.383
207.2
208.980
(209)
(210)
(222)
Lutetium
Hafnium
Tantalum
Tungsten
Rhenium
Osmium
195.085
200.59
Barium
192.217
196.967
Cesium
190.23
Platinum
Gold
Mercury
Thallium
Lead
Bismuth
Polonium
Astatine
Radon
87
88
103
104
105
106
107
108
109
110
Ds
111
Rg
(262)
(267)
(276)
(281)
(280)
69
70
Fr
Lr
Ra
(223)
(226)
Francium
Radium
Rf
Lawrencium Rutherfordium
57
Lanthanide Series
Actinide Series
Db
Sg
Bh
Hs
(268)
(271)
(272)
(270)
Dubnium
Seaborgium
Bohrium
Hassium
58
59
60
61
Iridium
Mt
Mass numbers in parentheses are those of
the most stable or most common isotope.
Meitnerium Darmstadtium Roentgenium
62
63
64
65
66
67
68
La
Ce
Pr
Nd
Pm
Sm
Eu
Gd
Tb
Dy
Ho
Er
Tm
Yb
138.905
140.116
140.908
144.242
(145)
150.36
151.964
157.25
158.925
162.500
164.930
167.259
168.934
173.055
Lanthanum
Cerium
Samarium
Europium
Gadolinium
Terbium
Dysprosium
Holmium
Erbium
Thulium
Ytterbium
89
90
94
95
96
97
98
99
100
101
Praseodymium Neodymium Promethium
91
92
Pa
U
93
Np
Pu
Am
Cm
Bk
Cf
Es
Fm
Md
102
Ac
Th
No
(227)
232.038
231.036
238.029
(237)
(244)
(243)
(247)
(247)
(251)
(252)
(257)
(258)
(259)
Actinium
Thorium
Protactinium
Uranium
Neptunium
Plutonium
Americium
Curium
Berkelium
Californium
Einsteinium
Fermium
Mendelevium
Nobelium
Updated Spring 2011