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Atomic weight
Lu · lutetium
루테튬
Takeaway
- Recommended or revised 9 times between 1902 and 2024 (first record 1909, latest revision 2024).
- Of 4 revisions whose previous recommendation had an uncertainty, 1 (2024) put the new value outside the previous (expanded) range.
- The current standard atomic weight is 174.966 69(5) (recommended in 2024).
| 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 |
|---|---|---|---|---|---|---|
| 1909 | 174.0 | no uncertainty | O=16 | 173.993475 | 10.1021/ja01931a001 | |
| 1916 | 175.0 | no uncertainty | O=16 | 174.9934375 | 10.1021/ja02176a001 | |
| 1940 | 174.99 | no uncertainty | O=16 | 174.98343788 | 10.1039/JR9400000475 | |
| 1961 | 174.97 | no uncertainty | 12C=12 | 174.97 | 10.1021/ja00881a001 | |
| 1969 | 174.97(1) | value(uncertainty) | 12C=12 | 174.97 | 10.1351/pac197021010091 | |
| 1977 | 174.967(3) | value(uncertainty) | 12C=12 | 174.967 | −0.300 | 10.1351/pac197951020405 |
| 1981 | 174.967(1) | value(uncertainty) | 12C=12 | 174.967 | 0.000 | 10.1351/pac198355071101 |
| 2007 | 174.9668(1) | value(uncertainty) | 12C=12 | 174.9668 | −0.200 | 10.1351/PAC-REP-09-08-03 |
| 2024 | 174.966 69(5) | value(uncertainty) | 12C=12 | 174.96669 | −1.100 | no DOI |
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