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Atomic weight
O · oxygen
산소
Takeaway
- Recommended or revised 4 times between 1902 and 2024 (first record 1902, latest revision 2009).
- The one revision whose previous recommendation had an uncertainty kept the new value inside the previous (expanded) range.
- Since 2009, it has been given as the interval [15.999 03, 15.999 77] 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 | 16(exact) | reference (exact) | O=16 | 15.9994 | 10.1007/BF01370337 | |
| 1961 | 15.9994(1) | value(uncertainty) | 12C=12 | 15.9994 | 10.1021/ja00881a001 | |
| 1969 | 15.9994(3) | value(uncertainty) | 12C=12 | 15.9994 | 0.000 | 10.1351/pac197021010091 |
| 2009 | [15.999 03, 15.999 77] | interval | 12C=12 | 15.9994 (interval midpoint, for calculation) | 10.1351/PAC-REP-10-09-14 |
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