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Atomic weight
Gd · gadolinium
가돌리늄
Takeaway
- Recommended or revised 9 times between 1902 and 2024 (first record 1902, latest revision 2024).
- The one revision whose previous recommendation had an uncertainty kept the new value inside the previous (expanded) range.
- The current standard atomic weight is 157.249(2) (recommended in 2024).
| 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 | 156 | no uncertainty | O=16 | 155.99415 | 10.1007/BF01370337 | |
| 1909 | 157.3 | no uncertainty | O=16 | 157.29410125 | 10.1021/ja01931a001 | |
| 1925 | 157.26 | no uncertainty | O=16 | 157.25410275 | 10.1039/CT9252700913 | |
| 1931 | 157.3 | no uncertainty | O=16 | 157.29410125 | 10.1039/JR9310001617 | |
| 1937 | 156.9 | no uncertainty | O=16 | 156.89411625 | 10.1039/JR9370001900 | |
| 1955 | 157.26 | no uncertainty | O=16 | 157.25410275 | 10.1021/ja01595a001 | |
| 1961 | 157.25 | no uncertainty | 12C=12 | 157.25 | 10.1021/ja00881a001 | |
| 1969 | 157.25(3) | value(uncertainty) | 12C=12 | 157.25 | 10.1351/pac197021010091 | |
| 2024 | 157.249(2) | value(uncertainty) | 12C=12 | 157.249 | −0.033 | no DOI |
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