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Atomic weight
Ta · tantalum
탄탈럼
Takeaway
- Recommended or revised 11 times between 1902 and 2024 (first record 1902, latest revision 2005).
- Both revisions whose previous recommendation had an uncertainty kept the new value inside the previous (expanded) range.
- The current standard atomic weight is 180.947 88(2) (recommended in 2005).
| 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 | 183 | no uncertainty | O=16 | 182.9931375 | 10.1007/BF01370337 | |
| 1907 | 181 | no uncertainty | O=16 | 180.9932125 | 10.1021/ja01956a001 | |
| 1909 | 181.0 | no uncertainty | O=16 | 180.9932125 | 10.1021/ja01931a001 | |
| 1912 | 181.5 | no uncertainty | O=16 | 181.49319375 | 10.1021/ja02224a601 | |
| 1931 | 181.4 | no uncertainty | O=16 | 181.3931975 | 10.1039/JR9310001617 | |
| 1936 | 180.88 | no uncertainty | O=16 | 180.873217 | 10.1039/JR9370001893 | |
| 1953 | 180.95 | no uncertainty | O=16 | 180.94321438 | 10.1039/JR9540004713 | |
| 1961 | 180.948 | no uncertainty | 12C=12 | 180.948 | 10.1021/ja00881a001 | |
| 1969 | 180.9479(3) | value(uncertainty) | 12C=12 | 180.9479 | 10.1351/pac197021010091 | |
| 1979 | 180.9479(1) | value(uncertainty) | 12C=12 | 180.9479 | 0.000 | 10.1351/pac198052102349 |
| 2005 | 180.947 88(2) | value(uncertainty) | 12C=12 | 180.94788 | −0.200 | 10.1351/pac200678112051 |
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