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Atomic weightNo standard atomic weight (radioactive)
Tc · technetium
테크네튬
Takeaway
- Recommended or revised once between 1902 and 2024 (first record 1969, latest revision 1969).
- It has no standard atomic weight today: a radioactive element without a characteristic terrestrial isotopic composition.
| 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 |
|---|---|---|---|---|---|---|
| 1969 | 98.9062(1) | value(uncertainty) | 12C=12 | 98.9062 | 10.1351/pac197021010091 |
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