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Atomic weight
Ge · germanium
저마늄
Takeaway
- Recommended or revised 9 times between 1902 and 2024 (first record 1902, latest revision 2011).
- Of 4 revisions whose previous recommendation had an uncertainty, 1 (1999) put the new value outside the previous (expanded) range.
- The current standard atomic weight is 72.630(8) (recommended in 2011).
| 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 | 72 | no uncertainty | O=16 | 71.9973 | 10.1007/BF01370337 | |
| 1903 | 72.5 | no uncertainty | O=16 | 72.49728125 | 10.1021/ja02003a001 | |
| 1925 | 72.60 | no uncertainty | O=16 | 72.5972775 | 10.1039/CT9252700913 | |
| 1961 | 72.59 | no uncertainty | 12C=12 | 72.59 | 10.1021/ja00881a001 | |
| 1969 | 72.59(3) | value(uncertainty) | 12C=12 | 72.59 | 10.1351/pac197021010091 | |
| 1985 | 72.61(2) | value(uncertainty) | 12C=12 | 72.61 | 0.667 | 10.1351/pac198658121677 |
| 1999 | 72.64(1) | value(uncertainty) | 12C=12 | 72.64 | 1.500 | 10.1351/pac200173040667 |
| 2009 | 72.63(1) | value(uncertainty) | 12C=12 | 72.63 | −1.000 | 10.1351/PAC-REP-10-09-14 |
| 2011 | 72.630(8) | value(uncertainty) | 12C=12 | 72.63 | 0.000 | 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