Periodic Table of Elements
1
1
2
1
1 H
5 Rb
2
8
8
1
6 Cs
Caesium
132.9054519
87
7 Fr
Francium
(223)
2
2
Hg Liquid
H Gas
12
Mg
2
8
2
2
8
18
8
1
20
Ca
2
8
8
2
Rf Unknown
38
Sr
2
8
18
32
18
8
1
56
Ba
Barium
137.327
88
Ra
Radium
(226)
2
8
9
2
21
Sc
Scandium
44.955912
2
8
18
8
2
39
Y
2
8
18
18
8
2
2
8
18
32
18
8
2
22
Ti
2
8
10
2
Titanium
47.867
2
8
18
9
2
Yttrium
88.90585
Strontium
87.62
2
8
18
18
8
1
14
15
16
17
18
2
K
2
8
K
L
2
8
8
K
L
M
2
8
18
8
K
L
M
N
2
8
18
18
8
K
L
M
N
O
2
8
18
32
18
8
K
L
M
N
O
P
2
8
18
32
32
Ununoctium 18
8
K
L
M
N
O
P
Q
He
Nonmetals
Lanthanoids
Actinoids
Helium
4.002602
5
2
3
40
Zr
57–71
Hf
Hafnium
178.49
89–103
V
2
8
11
2
2
8
18
10
2
41
Nb
2
8
18
12
1
Niobium
92.90638
2
8
18
32
10
2
2
8
18
32
32
Rutherfordium 10
2
73
Ta
Tantalum
180.94788
104
105
Rf
Db
(261)
Dubnium
(262)
24
Cr
2
8
13
1
Chromium
51.9961
Vanadium
50.9415
Zirconium
91.224
72
23
42
Mo
25
Mn
Manganese
54.938045
2
8
18
13
1
Molybdenum
95.96
43
Tc
74
2
8
18
32
32
11
2
106
107
Sg
Bh
(266)
Bohrium
(264)
Tungsten
183.84
2
8
18
32
12
2
2
8
18
32
32
Seaborgium 12
2
75
Re
Rhenium
186.207
26
Fe
2
8
14
2
Iron
55.845
2
8
18
14
1
Technetium
(97.9072)
2
8
18
32
11
2
W
2
8
13
2
44
Ru
76
2
8
18
32
32
13
2
108
Os
Osmium
190.23
Hs
Hassium
(277)
Co
2
8
15
2
Cobalt
58.933195
2
8
18
15
1
45
Rh
2
8
18
32
14
2
77
2
8
18
32
32
14
2
109
Ir
Iridium
192.217
Mt
Meitnerium
(268)
28
Ni
2
8
16
2
Nickel
58.6934
2
8
18
16
1
Rhodium
102.90550
Ruthenium
101.07
2
8
18
32
13
2
27
46
Pd
2
8
18
32
32
15
2
78
Pt
Platinum
195.084
Cu
2
8
18
1
2
8
18
18
0
47
Ag
2
8
18
18
1
2
8
18
32
32
Darmstadtium17
1
79
Au
Gold
196.966569
111
Ds
Rg
(271)
2
8
18
32
18
1
2
8
18
32
32
Roentgenium 18
1
110
Zn
2
8
18
2
48
Cd
(272)
80
Hg
Mercury
200.59
2
8
18
32
32
Copernicium 18
2
8
2
6
9
2
7
10
N
O
F
Ne
Nitrogen
14.0067
Oxygen
15.9994
Fluorine
18.9984032
Neon
20.1797
2
8
3
31
Ga
49
In
81
Tl
Thallium
204.3833
112
113
Cn
Uut
(285)
Ununtrium
(284)
14
Si
2
8
4
Silicon
28.0855
2
8
18
3
32
Ge
2
8
18
18
3
50
Sn
2
8
18
4
82
2
8
18
32
32
18
3
114
Pb
Lead
207.2
Fl
Flerovium
(289)
P
2
8
5
33
As
2
8
18
18
4
51
Sb
2
8
18
5
2
8
18
32
32
18
4
83
Bi
Bismuth
208.98040
S
2
8
6
34
Se
2
8
18
18
5
52
Te
2
8
18
6
2
8
18
32
32
Ununpentium 18
5
84
Po
Polonium
(208.9824)
Cl
2
8
7
35
Br
2
8
18
18
6
53
I
2
8
18
7
2
8
18
32
32
Livermorium 18
6
85
At
Astatine
(209.9871)
115
116
117
Uup
Lv
Uus
(288)
(292)
Ar
36
Kr
Krypton
83.798
2
8
18
18
7
Iodine
126.90447
2
8
18
32
18
6
18
Argon
39.948
Bromine
79.904
Tellurium
127.60
2
8
18
32
18
5
17
Chlorine
35.453
Selenium
78.96
Antimony
121.760
2
8
18
32
18
4
16
Sulfur
32.065
Arsenic
74.92160
Tin
118.710
2
8
18
32
18
3
15
Phosphorus
30.973762
Germanium
72.63
Indium
114.818
2
8
18
32
18
2
2
5
Carbon
12.0107
Gallium
69.723
2
8
18
18
2
7
C
Al
Cadmium
112.411
Silver
107.8682
2
8
18
32
17
1
30
2
4
Boron
10.811
13
Zinc
65.38
Copper
63.546
Palladium
106.42
2
8
18
32
15
2
29
6
B
Aluminium
26.9815386
Calcium
40.078
Rubidium
85.4678
55
13
Magnesium
24.3050
Potassium
39.0983
37
12
Noble gases
4 K
11
Other
nonmetals
19
10
Poor metals
Sodium
22.98976928
9
Transition
metals
3 Na
4
Beryllium
9.012182
2
8
1
8
Metals
Alkaline
earth metals
11
7
C Solid
Be
Lithium
6.941
6
Alkali metals
2 Li
5
2
Name
Atomic Weight
2
1
4
Atomic #
Symbol
Hydrogen
1.00794
3
3
54
Xe
Xenon
131.293
2
8
18
32
18
7
86
Rn
Radon
(222.0176)
118
Uuo
Ununseptium
(294)
For elements with no stable isotopes, the mass number of the isotope with the longest half-life is in parentheses.
Periodic Table Design and Interface Copyright © 1997 Michael Dayah. http://www.ptable.com/ Last updated: May 9, 2013
2
8
18
18
9
Lanthanum 2
57
58
La
Ce
138.90547
Cerium
140.116
89
Ac
Actinium
(227)
Michael Dayah
2
8
18
32
18
9
2
90
Th
Thorium
232.03806
2
8
18
19
9
2
2
8
18
32
18
10
2
59
2
8
18
21
8
Praseodymium 2
60
Pr
2
8
18
22
8
Neodymium 2
Nd
2
8
18
23
8
Promethium 2
140.90765
144.242
2
8
18
32
20
Protactinium 9
2
92
91
Pa
U
231.03588
Uranium
238.02891
2
8
18
32
21
9
2
61
62
Pm
Sm
(145)
Samarium
150.36
93
Np
Neptunium
(237)
2
8
18
32
22
9
2
94
Pu
Plutonium
(244)
2
8
18
24
8
2
2
8
18
32
24
8
2
63
Eu
Europium
151.964
95
Am
Americium
(243)
2
8
18
25
8
2
2
8
18
32
25
8
2
2
8
18
25
9
Gadolinium 2
64
65
Gd
Tb
157.25
Terbium
158.92535
96
Cm
Curium
(247)
2
8
18
32
25
9
2
97
Bk
Berkelium
(247)
2
8
18
27
8
2
2
8
18
32
27
8
2
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2
8
18
28
8
Dysprosium 2
66
67
Dy
Ho
162.500
Holmium
164.93032
2
8
18
32
28
Californium 8
2
98
Cf
(251)
2
8
18
29
8
2
2
8
18
32
29
Einsteinium 8
2
99
68
Er
Erbium
167.259
100
Es
Fm
(252)
Fermium
(257)
2
8
18
30
8
2
69
2
8
18
32
30
8
2
101
Tm
Thulium
168.93421
2
8
18
31
8
2
2
8
18
32
31
Mendelevium 8
2
70
Yb
Ytterbium
173.054
102
Md
No
(258)
Nobelium
(259)
2
8
18
32
8
2
71
2
8
18
32
32
8
2
103
Lu
Lutetium
174.9668
2
8
18
32
9
2
2
8
18
32
32
Lawrencium 9
2
Lr
(262)
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