Forecast of Standard Atomic Weights for the Mononuclidic Elements – 2011 [electronic resource]
In this short report, I will provide an early warning about potential changes to the standard atomic weight values for the twenty mononuclidic and the so-called pseudo-mononuclidic (²³²Th and ²³¹Pa) chemical elements due to the estimated changes in the mass values to be published in the next Atomic...
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Online Access |
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| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Upton, N.Y. : Oak Ridge, Tenn. :
Brookhaven National Laboratory ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy,
2011.
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| Subjects: |
MARC
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| 245 | 0 | 0 | |a Forecast of Standard Atomic Weights for the Mononuclidic Elements – 2011 |h [electronic resource] |
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| 500 | |a 46th IUPAC General Assembly; San Juan, Puerto Rico; 20110727 through 20110805. | ||
| 500 | |a OFFICE OF NUCLEAR ENERGY, SCIENCE, & TECHNOLOGY. | ||
| 520 | 3 | |a In this short report, I will provide an early warning about potential changes to the standard atomic weight values for the twenty mononuclidic and the so-called pseudo-mononuclidic (²³²Th and ²³¹Pa) chemical elements due to the estimated changes in the mass values to be published in the next Atomic Mass Tables within the next two years. There have been many new measurements of atomic masses, since the last published Atomic Mass Table. The Atomic Mass Data Center has released an unpublished version of the present status of the atomic mass values as a private communication. We can not update the Standard Atomic Weight Table at this time based on these unpublished values but we can anticipate how many changes are probably going to be expected in the next few years on the basis of the forthcoming publication of the Atomic Mass Table. I will briefly discuss the procedures that the Atomic Weights Commission used in deriving the recommended Standard Atomic Weight values and their uncertainties from the atomic mass values. I will also discuss some concern raised about a proposed change in the definition of the mole. The definition of the mole is now connected directly to the mass of a ¹²C isotope (which is defined as 12 exactly) and to the kilogram. A change in the definition of the mole will probably impact the mass of ¹²C. | |
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