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Atomic weight
Pb · lead
납
Takeaway
- Recommended or revised 8 times between 1902 and 2024 (first record 1902, latest revision 2020).
- Since 2020, it has been given as the interval [206.14, 207.94] 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 | 206.9 | no uncertainty | O=16 | 206.89224125 | 10.1007/BF01370337 | |
| 1909 | 207.10 | no uncertainty | O=16 | 207.09223375 | 10.1021/ja01931a001 | |
| 1916 | 207.20 | no uncertainty | O=16 | 207.19223 | 10.1021/ja02176a001 | |
| 1931 | 207.22 | no uncertainty | O=16 | 207.21222925 | 10.1039/JR9310001617 | |
| 1937 | 207.21 | no uncertainty | O=16 | 207.20222962 | 10.1039/JR9370001900 | |
| 1961 | 207.19 | no uncertainty | 12C=12 | 207.19 | 10.1021/ja00881a001 | |
| 1969 | 207.2(1) | value(uncertainty) | 12C=12 | 207.2 | 10.1351/pac197021010091 | |
| 2020 | [206.14, 207.94] | interval | 12C=12 | 207.04 (interval midpoint, for calculation) | 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