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Atomic weight
N · nitrogen
질소
Takeaway
- Recommended or revised 8 times between 1902 and 2024 (first record 1902, latest revision 2009).
- Both revisions whose previous recommendation had an uncertainty kept the new value inside the previous (expanded) range.
- Since 2009, it has been given as the interval [14.006 43, 14.007 28] 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 | 14.04 | no uncertainty | O=16 | 14.0394735 | 10.1007/BF01370337 | |
| 1907 | 14.01 | no uncertainty | O=16 | 14.00947462 | 10.1021/ja01956a001 | |
| 1920 | 14.008 | no uncertainty | O=16 | 14.0074747 | 10.1021/ja02233a600 | |
| 1961 | 14.0067 | no uncertainty | 12C=12 | 14.0067 | 10.1021/ja00881a001 | |
| 1969 | 14.0067(1) | value(uncertainty) | 12C=12 | 14.0067 | 10.1351/pac197021010091 | |
| 1985 | 14.006 74(7) | value(uncertainty) | 12C=12 | 14.00674 | 0.400 | 10.1351/pac198658121677 |
| 1999 | 14.0067(2) | value(uncertainty) | 12C=12 | 14.0067 | −0.571 | 10.1351/pac200173040667 |
| 2009 | [14.006 43, 14.007 28] | interval | 12C=12 | 14.006855 (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