Other pages in this series (88)
Atomic weight
Kr · krypton
크립톤
Takeaway
- Recommended or revised 8 times between 1902 and 2024 (first record 1902, latest revision 2001).
- The one revision whose previous recommendation had an uncertainty kept the new value inside the previous (expanded) range.
- The current standard atomic weight is 83.798(2) (recommended in 2001).
| 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 | 81.8 | no uncertainty | O=16 | 81.7969325 | 10.1007/BF01370337 | |
| 1910 | 83.0 | no uncertainty | O=16 | 82.9968875 | 10.1021/ja01919a001 | |
| 1911 | 82.92 | no uncertainty | O=16 | 82.9168905 | 10.1021/ja01928a001 | |
| 1925 | 82.9 | no uncertainty | O=16 | 82.89689125 | 10.1039/CT9252700913 | |
| 1932 | 83.7 | no uncertainty | O=16 | 83.69686125 | 10.1021/ja01343a001 | |
| 1951 | 83.80 | no uncertainty | O=16 | 83.7968575 | 10.1039/JR9530000001 | |
| 1969 | 83.80(1) | value(uncertainty) | 12C=12 | 83.8 | 10.1351/pac197021010091 | |
| 2001 | 83.798(2) | value(uncertainty) | 12C=12 | 83.798 | −0.200 | 10.1351/pac200375081107 |
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