List of elements by atomic mass
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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 brackets [] as the atomic mass.
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)2 3 4 | 1 | 1 |
2 | Helium | He | 4.002602(2)2 4 | 18 | 1 |
3 | Lithium | Li | 6.941(2)2 3 4 5 | 1 | 2 |
4 | Beryllium | Be | 9.012182(3) | 2 | 2 |
5 | Boron | B | 10.811(7)2 3 4 | 13 | 2 |
6 | Carbon | C | 12.0107(8)2 4 | 14 | 2 |
7 | Nitrogen | N | 14.0067(2)2 4 | 15 | 2 |
8 | Oxygen | O | 15.9994(3)2 4 | 16 | 2 |
9 | Fluorine | F | 18.9984032(5) | 17 | 2 |
10 | Neon | Ne | 20.1797(6)2 3 | 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)2 4 | 16 | 3 |
17 | Chlorine | Cl | 35.453(2)2 3 4 | 17 | 3 |
19 | Potassium (Kalium) | K | 39.0983(1) | 1 | 4 |
18 | Argon | Ar | 39.948(1)2 4 | 18 | 3 |
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 |
28 | Nickel | Ni | 58.6934(2) | 10 | 4 |
27 | Cobalt | Co | 58.933195(5) | 9 | 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)2 3 | 18 | 4 |
37 | Rubidium | Rb | 85.4678(3)2 | 1 | 5 |
38 | Strontium | Sr | 87.62(1)2 4 | 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)2 3 | 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)2 4 | 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)1 2 | n/a | 7 |
93 | Neptunium | Np | [237]1 | n/a | 7 |
92 | Uranium | U | 238.02891(3)1 2 3 | 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 | [294]1 | 18 | 7 |
Alkali metals | Alkaline earth metals | Lanthanides | Actinides | Transition metals |
Poor metals | Metalloids | Nonmetals | Halogens | Noble gases |
[edit] 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.
[edit] 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.
Standard · Vertical · Full names · Names and atomic masses · Text for last · Electron configurations
Metals and nonmetals · Blocks · Valences · Inline f-block · 218 elements · Alternatives
Lists of elements:
Name · Atomic symbol · Atomic number · Boiling point · Melting point · Density · Atomic mass
Groups:
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Periods:
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Series:
Alkalis · Alkaline earths · Lanthanides · Actinides · Transition metals
Poor metals · Metalloids · Nonmetals · Halogens · Noble gases