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Atomic weight
Pt · platinum
백금
Takeaway
- Recommended or revised 9 times between 1902 and 2024 (first record 1902, latest revision 2005).
- Of 3 revisions whose previous recommendation had an uncertainty, 1 (2005) put the new value outside the previous (expanded) range.
- The current standard atomic weight is 195.084(9) (recommended in 2005).
| 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 | 194.8 | no uncertainty | O=16 | 194.792695 | 10.1007/BF01370337 | |
| 1909 | 195.0 | no uncertainty | O=16 | 194.9926875 | 10.1021/ja01931a001 | |
| 1911 | 195.2 | no uncertainty | O=16 | 195.19268 | 10.1021/ja01928a001 | |
| 1925 | 195.23 | no uncertainty | O=16 | 195.22267888 | 10.1039/CT9252700913 | |
| 1955 | 195.09 | no uncertainty | O=16 | 195.08268412 | 10.1021/ja01595a001 | |
| 1969 | 195.09(3) | value(uncertainty) | 12C=12 | 195.09 | 10.1351/pac197021010091 | |
| 1979 | 195.08(3) | value(uncertainty) | 12C=12 | 195.08 | −0.333 | 10.1351/pac198052102349 |
| 1995 | 195.078(2) | value(uncertainty) | 12C=12 | 195.078 | −0.067 | 10.1351/pac199668122339 |
| 2005 | 195.084(9) | value(uncertainty) | 12C=12 | 195.084 | 3.000 | 10.1351/pac200678112051 |
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