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Atomic weight
Re · rhenium
레늄
Takeaway
- Recommended or revised 5 times between 1902 and 2024 (first record 1931, latest revision 1973).
- The one revision whose previous recommendation had an uncertainty kept the new value inside the previous (expanded) range.
- The current standard atomic weight is 186.207(1) (recommended in 1973).
| 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 |
|---|---|---|---|---|---|---|
| 1931 | 186.31 | no uncertainty | O=16 | 186.30301338 | 10.1039/JR9310001617 | |
| 1955 | 186.22 | no uncertainty | O=16 | 186.21301675 | 10.1021/ja01595a001 | |
| 1961 | 186.2 | no uncertainty | 12C=12 | 186.2 | 10.1021/ja00881a001 | |
| 1969 | 186.2(1) | value(uncertainty) | 12C=12 | 186.2 | 10.1351/pac197021010091 | |
| 1973 | 186.207(1) | value(uncertainty) | 12C=12 | 186.207 | 0.070 | 10.1351/pac197437040589 |
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