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Atomic weight
Yb · ytterbium
이터븀
Takeaway
- Recommended or revised 9 times between 1902 and 2024 (first record 1902, latest revision 2015).
- Of 2 revisions whose previous recommendation had an uncertainty, 1 (2015) put the new value outside the previous (expanded) range.
- The current standard atomic weight is 173.045(10) (recommended in 2015).
| 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 | 173.0 | no uncertainty | O=16 | 172.9935125 | 10.1007/BF01370337 | |
| 1909 | 172.0 | no uncertainty | O=16 | 171.99355 | 10.1021/ja01931a001 | |
| 1916 | 173.5 | no uncertainty | O=16 | 173.49349375 | 10.1021/ja02176a001 | |
| 1925 | 173.6 | no uncertainty | O=16 | 173.59349 | 10.1039/CT9252700913 | |
| 1931 | 173.5 | no uncertainty | O=16 | 173.49349375 | 10.1039/JR9310001617 | |
| 1934 | 173.04 | no uncertainty | O=16 | 173.033511 | 10.1039/JR9340000499 | |
| 1969 | 173.04(3) | value(uncertainty) | 12C=12 | 173.04 | 10.1351/pac197021010091 | |
| 2007 | 173.054(5) | value(uncertainty) | 12C=12 | 173.054 | 0.467 | 10.1351/PAC-REP-09-08-03 |
| 2015 | 173.045(10) | value(uncertainty) | 12C=12 | 173.045 | −1.800 | 10.1515/pac-2019-0603 |
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