Difference between revisions of "Data:Atomic weights of the elements 2007"
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| − | The following is the 2007 IUPAC list of | + | The following is the 2007 IUPAC list of [[standard atomic weight]]s approved by the Commission on Isotopic Abundances and Atomic Weights (CIAAW) and published in ''[[Pure and Applied Chemistry]]''.<ref>{{IUPAC atomic weights 2007}}.</ref> Elements with no stable isotopes ([[Tecnetium|Tc]], [[Promethium|Pm]], [[Polonium|Po]]–) have been omitted, except for [[thorium]], [[protactinium]] and [[uranium]] which have a characteristic terrestrial isotopic composition. |
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Latest revision as of 03:18, 7 April 2011
The following is the 2007 IUPAC list of standard atomic weights approved by the Commission on Isotopic Abundances and Atomic Weights (CIAAW) and published in Pure and Applied Chemistry.[1] Elements with no stable isotopes (Tc, Pm, Po–) have been omitted, except for thorium, protactinium and uranium which have a characteristic terrestrial isotopic composition.
| Z | Name | Symbol | Atomic weight | Footnotes |
|---|---|---|---|---|
| 1 | hydrogen | H | 1.007 94(7) | g m r |
| 2 | helium | He | 4.002 602(2) | g r |
| 3 | lithium | Li | [6.941(2)]† | g m r |
| 4 | beryllium | Be | 9.012 182(3) | |
| 5 | boron | B | 10.811(7) | g m r |
| 6 | carbon | C | 12.0107(8) | g r |
| 7 | nitrogen | N | 14.0067(2) | g r |
| 8 | oxygen | O | 15.9994(3) | g r |
| 9 | fluorine | F | 18.998 4032(5) | |
| 10 | neon | Ne | 20.1797(6) | g m |
| 11 | sodium | Na | 22.989 769 28(2) | |
| 12 | magnesium | Mg | 24.3050(6) | |
| 13 | aluminium | Al | 26.981 5386(8) | |
| 14 | silicon | Si | 28.0855(3) | r |
| 15 | phosphorus | P | 30.973 762(2) | |
| 16 | sulfur | S | 32.065(5) | g r |
| 17 | chlorine | Cl | 35.453(2) | g m r |
| 18 | argon | Ar | 39.948(1) | g r |
| 19 | potassium | K | 39.0983(1) | |
| 20 | calcium | Ca | 40.078(4) | g |
| 21 | scandium | Sc | 44.955 912(6) | |
| 22 | titanium | Ti | 47.867(1) | |
| 23 | vanadium | V | 50.9415(1) | |
| 24 | chromium | Cr | 51.9961(6) | |
| 25 | manganese | Mn | 54.938 045(5) | |
| 26 | iron | Fe | 55.845(2) | |
| 27 | cobalt | Co | 58.933 195(5) | |
| 28 | nickel | Ni | 58.6934(4) | r |
| 29 | copper | Cu | 63.546(3) | r |
| 30 | zinc | Zn | 65.38(2) | r |
| 31 | gallium | Ga | 69.723(1) | |
| 32 | germanium | Ge | 72.64(1) | |
| 33 | arsenic | As | 74.921 60(2) | |
| 34 | selenium | Se | 78.96(3) | r |
| 35 | bromine | Br | 79.904(1) | |
| 36 | krypton | Kr | 83.798(2) | g m |
| 37 | rubidium | Rb | 85.4678(3) | g |
| 38 | strontium | Sr | 87.62(1) | g r |
| 39 | yttrium | Y | 88.905 85(2) | |
| 40 | zirconium | Zr | 91.224(2) | g |
| 41 | niobium | Nb | 92.906 38(2) | |
| 42 | molybdenum | Mo | 95.96(2) | g r |
| 44 | ruthenium | Ru | 101.07(2) | g |
| 45 | rhodium | Rh | 102.905 50(2) | |
| 46 | palladium | Pd | 106.42(1) | g |
| 47 | silver | Ag | 107.8682(2) | g |
| 48 | cadmium | Cd | 112.411(8) | g |
| 49 | indium | In | 114.818(3) | |
| 50 | tin | Sn | 118.710(7) | g |
| 51 | antimony | Sb | 121.760(1) | g |
| 52 | tellurium | Te | 127.60(3) | g |
| 53 | iodine | I | 126.904 47(3) | |
| 54 | xenon | Xe | 131.293(6) | g m |
| 55 | caesium | Cs | 132.905 4519(2) | |
| 56 | barium | Ba | 137.327(7) | |
| 57 | lanthanum | La | 138.905 47(7) | g |
| 58 | cerium | Ce | 140.116(1) | g |
| 59 | praseodymium | Pr | 140.907 65(2) | |
| 60 | neodymium | Nd | 144.242(3) | g |
| 62 | samarium | Sm | 150.36(2) | g |
| 63 | europium | Eu | 151.964(1) | g |
| 64 | gadolinium | Gd | 157.25(3) | g |
| 65 | terbium | Tb | 158.925 35(2) | |
| 66 | dysprosium | Dy | 162.500(1) | g |
| 67 | holmium | Ho | 164.930 32(2) | |
| 68 | erbium | Er | 167.259(3) | g |
| 69 | thulium | Tm | 168.934 21(2) | |
| 70 | ytterbium | Yb | 173.054(5) | g |
| 71 | lutetium | Lu | 174.9668(1) | g |
| 72 | hafnium | Hf | 178.49(2) | |
| 73 | tantalum | Ta | 180.947 88(2) | |
| 74 | tungsten | W | 183.84(1) | |
| 75 | rhenium | Re | 186.207(1) | |
| 76 | osmium | Os | 190.23(3) | g |
| 77 | iridium | Ir | 192.217(3) | |
| 78 | platinum | Pt | 195.084(9) | |
| 79 | gold | Au | 196.966 569(4) | |
| 80 | mercury | Hg | 200.59(2) | |
| 81 | thallium | Tl | 204.3833(2) | |
| 82 | lead | Pb | 207.2(1) | g r |
| 83 | bismuth | Bi | 208.980 40(1) | |
| 90 | thorium* | Th | 232.038 06(2) | g |
| 91 | protactinium* | Pa | 231.035 88(2) | |
| 92 | uranium* | U | 238.028 91(3) | g m |
Footnotes to table
† Commercially available Li materials have atomic weights that range between 6.939 and 6.996; if a more accurate value is required, it must be determined for the specific material.
g Geological specimens are known in which the element has an isotopic composition outside the limits for normal material. The difference between the atomic weight of the element in such specimens and that given in the table may exceed the stated uncertainty.
m Modified isotopic compositions may be found in commercially available material because it has been subjected to an undisclosed or inadvertent isotopic fractionation. Substantial deviations in atomic weight of the element from that given in the table can occur.
r Range in isotopic composition of normal terrestrial material prevents a more precise Ar(E) being given; the tabulated Ar(E) value and uncertainty should be applicable to normal material.
References
- ↑ Atomic Weights of the Elements 2007. Pure Appl. Chem. 2009, 81 (11), 2131–56. DOI: 10.1351/PAC-REP-09-08-03.
External links
 |
See also the corresponding article on Wikipedia. |
- IUPAC Commission on Isotopic Abundances and Atomic Weights
- NIST relative atomic masses of all isotopes and the standard atomic weights of the elements
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