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This is a list of chemical elements, sorted by atomic mass (or most stable isotope) and color coded according to type of element. Each element's atomic number, name, element symbol, and group and period numbers on the periodic table are given. The number in parenthesis gives the uncertainty in the "concise notation" defined in the IUPAC reference "whereby standard uncertainty is given in parenthesis next to the least significant digits to which it applies", e.g., 1.00794(7) stands for 1.00794 ± 0.00007. For artificial elements the nucleon count of the most stable isotope is listed as the atomic mass.
Chemical Series of the Periodic Table
Alkali metals
Alkaline earth metals
Lanthanides
Actinides
Transition metals
Poor metals
Metalloids
Nonmetals
Halogens
Noble gases
Atomic Number
Name
Symbol
Atomic Mass
Group
Period
1
Hydrogen
H
1.00794(7)234
1
1
2
Helium
He
4.002602(2)24
18
1
3
Lithium
Li
6.941(2)2345
1
2
4
Beryllium
Be
9.012182(3)
2
2
5
Boron
B
10.811(7)234
13
2
6
Carbon
C
12.0107(8)24
14
2
7
Nitrogen
N
14.0067(2)24
15
2
8
Oxygen
O
15.9994(3)24
16
2
9
Fluorine
F
18.9984032(5)
17
2
10
Neon
Ne
20.1797(6)23
18
2
11
Sodium (Natrium)
Na
22.98976928(2)
1
3
12
Magnesium
Mg
24.3050(6)
2
3
13
Aluminium (Aluminum)
Al
26.9815386(8)
13
3
14
Silicon
Si
28.0855(3)4
14
3
15
Phosphorus
P
30.973762(2)
15
3
16
Sulfur
S
32.065(5)24
16
3
17
Chlorine
Cl
35.453(2)234
17
3
18
Argon
Ar
39.948(1)24
18
3
19
Potassium (Kalium)
K
39.0983(1)
1
4
20
Calcium
Ca
40.078(4)2
2
4
21
Scandium
Sc
44.955912(6)
3
4
22
Titanium
Ti
47.867(1)
4
4
23
Vanadium
V
50.9415(1)
5
4
24
Chromium
Cr
51.9961(6)
6
4
25
Manganese
Mn
54.938045(5)
7
4
26
Iron (Ferrum)
Fe
55.845(2)
8
4
27
Cobalt
Co
58.933195(5)
9
4
28
Nickel
Ni
58.6934(2)
10
4
29
Copper (Cuprum)
Cu
63.546(3)4
11
4
30
Zinc
Zn
65.409(4)
12
4
31
Gallium
Ga
69.723(1)
13
4
32
Germanium
Ge
72.64(1)
14
4
33
Arsenic
As
74.92160(2)
15
4
34
Selenium
Se
78.96(3)4
16
4
35
Bromine
Br
79.904(1)
17
4
36
Krypton
Kr
83.798(2)23
18
4
37
Rubidium
Rb
85.4678(3)2
1
5
38
Strontium
Sr
87.62(1)24
2
5
39
Yttrium
Y
88.90585(2)
3
5
40
Zirconium
Zr
91.224(2)2
4
5
41
Niobium
Nb
92.906 38(2)
5
5
42
Molybdenum
Mo
95.94(2)2
6
5
43
Technetium
Tc
[98]1
7
5
44
Ruthenium
Ru
101.07(2)2
8
5
45
Rhodium
Rh
102.905 50(2)
9
5
46
Palladium
Pd
106.42(1)2
10
5
47
Silver (Argentum)
Ag
107.8682(2)2
11
5
48
Cadmium
Cd
112.411(8)2
12
5
49
Indium
In
114.818(3)
13
5
50
Tin (Stannum)
Sn
118.710(7)2
14
5
51
Antimony (Stibium)
Sb
121.760(1)2
15
5
52
Tellurium
Te
127.60(3)2
16
5
53
Iodine
I
126.904 47(3)
17
5
54
Xenon
Xe
131.293(6)23
18
5
55
Caesium (Cesium)
Cs
132.9054519(2)
1
6
56
Barium
Ba
137.327(7)
2
6
57
Lanthanum
La
138.90547(7)2
n/a
6
58
Cerium
Ce
140.116(1)2
n/a
6
59
Praseodymium
Pr
140.90765(2)
n/a
6
60
Neodymium
Nd
144.242(3)2
n/a
6
61
Promethium
Pm
[145]1
n/a
6
62
Samarium
Sm
150.36(2)2
n/a
6
63
Europium
Eu
151.964(1)2
n/a
6
64
Gadolinium
Gd
157.25(3)2
n/a
6
65
Terbium
Tb
158.92535(2)
n/a
6
66
Dysprosium
Dy
162.500(1)2
n/a
6
67
Holmium
Ho
164.930 32(2)
n/a
6
68
Erbium
Er
167.259(3)2
n/a
6
69
Thulium
Tm
168.93421(2)
n/a
6
70
Ytterbium
Yb
173.04(3)2
n/a
6
71
Lutetium
Lu
174.967(1)2
3
6
72
Hafnium
Hf
178.49(2)
4
6
73
Tantalum
Ta
180.94788(2)
5
6
74
Tungsten (Wolfram)
W
183.84(1)
6
6
75
Rhenium
Re
186.207(1)
7
6
76
Osmium
Os
190.23(3)2
8
6
77
Iridium
Ir
192.217(3)
9
6
78
Platinum
Pt
195.084(9)
10
6
79
Gold (Aurum)
Au
196.966569(4)
11
6
80
Mercury (Hydrargyrum)
Hg
200.59(2)
12
6
81
Thallium
Tl
204.3833(2)
13
6
82
Lead (Plumbum)
Pb
207.2(1)24
14
6
83
Bismuth
Bi
208.98040(1)
15
6
84
Polonium
Po
[210]1
16
6
85
Astatine
At
[210]1
17
6
86
Radon
Rn
[220]1
18
6
87
Francium
Fr
[223]1
1
7
88
Radium
Ra
[226]1
2
7
89
Actinium
Ac
[227]1
n/a
7
91
Protactinium
Pa
231.03588(2)1
n/a
7
90
Thorium
Th
232.03806(2)12
n/a
7
93
Neptunium
Np
[237]1
n/a
7
92
Uranium
U
238.02891(3)123
n/a
7
95
Americium
Am
[243]1
n/a
7
94
Plutonium
Pu
[244]1
n/a
7
96
Curium
Cm
[247]1
n/a
7
97
Berkelium
Bk
[247]1
n/a
7
98
Californium
Cf
[251]1
n/a
7
99
Einsteinium
Es
[252]1
n/a
7
100
Fermium
Fm
[257]1
n/a
7
101
Mendelevium
Md
[258]1
n/a
7
102
Nobelium
No
[259]1
n/a
7
103
Lawrencium
Lr
[262]1
3
7
104
Rutherfordium
Rf
[261]1
4
7
105
Dubnium
Db
[262]1
5
7
106
Seaborgium
Sg
[266]1
6
7
107
Bohrium
Bh
[264]1
7
7
108
Hassium
Hs
[277]1
8
7
109
Meitnerium
Mt
[268]1
9
7
110
Darmstadtium
Ds
[271]1
10
7
111
Roentgenium
Rg
[272]1
11
7
112
Ununbium
Uub
[285]1
12
7
113
Ununtrium
Uut
[284]1
13
7
114
Ununquadium
Uuq
[289]1
14
7
115
Ununpentium
Uup
[288]1
15
7
116
Ununhexium
Uuh
[292]1
16
7
118
Ununoctium
Uuo
[293]1
18
7
Chemical Series of the Periodic Table
Alkali metals
Alkaline earth metals
Lanthanides
Actinides
Transition metals
Poor metals
Metalloids
Nonmetals
Halogens
Noble gases
Chemical series of the periodic table notes:
Note 1: The element does not have any stable nuclides, and a value in brackets, e.g. [209], indicates the mass number of the longest-lived isotope of the element. However, three elements, Thorium, Protactinium, and Uranium, have a characteristic terrestrial isotopic composition, and thus their atomic mass given.
Note 2: The isotopic composition of this element varies in some geological specimens, and the variation may exceed the uncertainty stated in the table.
Note 3: The isotopic composition of the element can vary in commercial materials, which can cause the atomic weight to deviate significantly from the given value.
Note 4: The isotopic composition varies in terrestrial material such that a more precise atomic weight can not be given.
Note 5: The atomic weight of commercial Lithium can vary between 6.939 and 6.996—analysis of the specific material is necessary to find a more accurate value.
Chemical series of the periodic table references:
Atomic Weights of the Elements 2001, Pure Appl. Chem. 75(8), 1107-1122, 2003. Retrieved June 30, 2005. Atomic weights of elements with atomic numbers from 1-109 taken from this source.
IUPAC Standard Atomic Weights Revised (2005).
WebElements Periodic Table. Retrieved June 30, 2005. Atomic weights of elements with atomic numbers 110-116 taken from this source.
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