Periodic Table of the Elements
1 1
H
Hydrogen
1.007 94
 
 

Atomic Number

 
6
C
Carbon
12.0107

Symbol

 

Name

 
Average Atomic Mass
 
 
  Group 18
  Group 2     Group 13 Group 14 Group 15 Group 16 Group 17 2
He
Helium
4.002 602
Group 1
2 3
Li
Lithium
6.941
4
Be
Beryllium
9.012 182
    5
B
Boron
10.811
6
C
Carbon
12.0107
7
N
Nitrogen
14.0067
8
O
Oxygen
15.9994
9
F
Fluorine
18.998 4032
10
Ne
Neon
20.1797
3 11
Na
Sodium
22.989 769 28
12
Mg
Magnesium
24.3050
    13
Al
Aluminum
26.981 5386
14
Si
Silicon
28.0855
15
P
Phosphorus
30.973 762
16
S
Sulfur
32.065
17
Cl
Chlorine
35.453
18
Ar
Argon
39.948
Group 3 Group 4 Group 5 Group 6 Group 7 Group 8 Group 9 Group 10 Group 11 Group 12
4 19
K
Potassium
39.0983
20
Ca
Calcium
40.078
21
Sc
Scandium
44.955 912
22
Ti
Titanium
47.867
23
V
Vanadium
50.9415
24
Cr
Chromium
51.9961
25
Mn
Manganese
54.938 045
26
Fe
Iron
55.845
27
Co
Cobalt
58.933 195
28
Ni
Nickel
58.6934
29
Cu
Copper
63.546
30
Zn
Zinc
65.38
31
Ga
Gallium
69.723
32
Ge
Germanium
72.64
33
As
Arsenic
74.921 60
34
Se
Selenium
78.96
35
Br
Bromine
79.904
36
Kr
Krypton
83.798
5 37
Rb
Rubidium
85.4678
38
Sr
Strontium
87.62
39
Y
Yttrium
88.905 85
40
Zr
Zirconium
91.224
41
Nb
Niobium
92.906 38
42
Mo
Molybdenum
95.96
43
Tc
Technetium
(98)
44
Ru
Ruthenium
101.07
45
Rh
Rhodium
102.905 50
46
Pd
Palladium
106.42
47
Ag
Silver
107.8682
48
Cd
Cadmium
112.411
49
In
Indium
114.818
50
Sn
Tin
118.710
51
Sb
Antimony
121.760
52
Te
Tellurium
127.60
53
I
Iodine
126.904 47
54
Xe
Xenon
131.293
6 55
Cs
Cesium
132.905 4519
56
Ba
Barium
137.327
57
La
Lanthanum
138.905 47
72
Hf
Hafnium
178.49
73
Ta
Tantalum
180.947 88
74
W
Tungsten
183.84
75
Re
Rhenium
186.207
76
Os
Osmium
190.23
77
Ir
Iridium
192.217
78
Pt
Platinum
195.084
79
Au
Gold
196.966 569
80
Hg
Mercury
200.59
81
Tl
Thallium
204.3833
82
Pb
Lead
207.2
83
Bi
Bismuth
208.980 40
84
Po 
Polonium
(209)
85
At 
Astatine
(210)
86
Rn
Radon
(222)
7 87
Fr
Francium
(223)
88
Ra
Radium
(226)
89
Ac
Actinium
(227)
104
Rf
Rutherfordium
(261)
105
Db
Dubnium
(262)
106
Sg
Seaborgium
(266)
107
Bh
Bohrium
(264)
108
Hs
Hassium
(277)
109
Mt
Meitnerium
(268)
110
Ds
Darmstadtium
(271)
111
Rg
Roentgenium
(272)
112
Uub*
Ununbium
(285)
113
Uut*
Ununtrium
(284)
114
Uuq*
Ununquadium
(289)
115
Uup*
Ununpentium
(288)
116
Uuh*
Ununhexium
(292)



118
Uuo*
Ununoctium
(294)
  • The systematic names and symbols for elements greater than 111 will be used until the approval of trivial names by the IUPAC.
  • For a discussion on why Po and At are not considered metalloids in this table, click here.
          The discoveries of elements with atomic numbers 112 through 116 and 118 have been reported but not fully confirmed.

58
Ce
Cerium
140.116
59
Pr
Praseodymium
140.907 65
60
Nd
Neodymium
144.242
61
Pm
Promethium
(145)
62
Sm
Samarium
150.36
63
Eu
Europium
151.964
64
Gd
Gadolinium
157.25
65
Tb
Terbium
158.925 35
66
Dy
Dysprosium
162.500
67
Ho
Holmium
164.930 32
68
Er
Erbium
167.259
69
Tm
Thulium
168.934 21
70
Yb
Ytterbium
173.054
71
Lu
Lutetium
174.9668
90
Th
Thorium
232.038 06
91
Pa
Protactinium
231.035 88
92
U
Uranium
238.028 91
93
Np
Neptunium
(237)
94
Pu
Plutonium
(244)
95
Am
Americium
(243)
96
Cm
Curium
(247)
97
Bk
Berkelium
(247)
98
Cf
Californium
(251)
99
Es
Einsteinium
(252)
100
Fm
Fermium
(257)
101
Md
Mendelevium
(258)
102
No
Nobelium
(259)
103
Lr
Lawrencium
(262)
                    The atomic masses listed in this table reflect the precision of current measurements. (Each value listed in parentheses is the mass number of that radioactive element's most stable or most common isotope.)