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Atomic weight
Br · bromine
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Takeaway
- Recommended or revised 6 times between 1902 and 2024 (first record 1902, latest revision 2011).
- The one revision whose previous recommendation had an uncertainty (1965) put the new value outside the previous (expanded) range.
- Since 2011, it has been given as the interval [79.901, 79.907] rather than a single value (the range found in normal materials).
| 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 | 79.96 | no uncertainty | O=16 | 79.9570015 | 10.1007/BF01370337 | |
| 1909 | 79.92 | no uncertainty | O=16 | 79.917003 | 10.1021/ja01931a001 | |
| 1925 | 79.916 | no uncertainty | O=16 | 79.91300315 | 10.1039/CT9252700913 | |
| 1961 | 79.909(2) | value(uncertainty) | 12C=12 | 79.909 | 10.1021/ja00881a001 | |
| 1965 | 79.904(1) | value(uncertainty) | 12C=12 | 79.904 | −2.500 | 10.1351/pac196918040569 |
| 2011 | [79.901, 79.907] | interval | 12C=12 | 79.904 (interval midpoint, for calculation) | 10.1351/PAC-REP-13-03-02 |
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