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Atomic weight
Xe · xenon
제논
Takeaway
- Recommended or revised 10 times between 1902 and 2024 (first record 1902, latest revision 1999).
- All 3 revisions whose previous recommendation had an uncertainty kept the new value inside the previous (expanded) range.
- The current standard atomic weight is 131.293(6) (recommended in 1999).
| Yearyear of the recommendation | Value (as printed)as printed in CIAAW's table; digits in parentheses are the uncertainty (expanded range) in the last digits | Notationvalue(uncertainty), interval or no uncertainty | Scalebefore 1961 oxygen = 16, from 1961 ¹²C = 12 | Value, ¹²C scalepre-1961 values multiplied by 15.9994/16 | z vs previous(new − previous) ÷ previous uncertainty | ReportDOI of the CIAAW report |
|---|---|---|---|---|---|---|
| 1902 | 128 | no uncertainty | O=16 | 127.9952 | 10.1007/BF01370337 | |
| 1909 | 128.0 | no uncertainty | O=16 | 127.9952 | 10.1021/ja01931a001 | |
| 1910 | 130.7 | no uncertainty | O=16 | 130.69509875 | 10.1021/ja01919a001 | |
| 1911 | 130.2 | no uncertainty | O=16 | 130.1951175 | 10.1021/ja01928a001 | |
| 1932 | 131.3 | no uncertainty | O=16 | 131.29507625 | 10.1021/ja01343a001 | |
| 1955 | 131.30 | no uncertainty | O=16 | 131.29507625 | 10.1021/ja01595a001 | |
| 1969 | 131.30(1) | value(uncertainty) | 12C=12 | 131.3 | 10.1351/pac197021010091 | |
| 1979 | 131.29(3) | value(uncertainty) | 12C=12 | 131.29 | −1.000 | 10.1351/pac198052102349 |
| 1985 | 131.29(2) | value(uncertainty) | 12C=12 | 131.29 | 0.000 | 10.1351/pac198658121677 |
| 1999 | 131.293(6) | value(uncertainty) | 12C=12 | 131.293 | 0.150 | 10.1351/pac200173040667 |
Source: Standard atomic weights © IUPAC/CIAAW 2016–2024. Commission on Isotopic Abundances and Atomic Weights, Historical changes of standard atomic weights (compiled by J. Meija), https://www.ciaaw.org/historical-atomic-weights.htm