Forecast of Standard Atomic Weights for the Mononuclidic Elements – 2011

Conference · Wed Jul 27 04:00:00 EDT 2011

OSTI ID:1027440

Holden, N E; Holden, N; Holden, N E

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 ({sup 232}Th and {sup 231}Pa) 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 The Atomic Mass Data Center has released an unpublished version of the present status of the atomic mass values as a private communication. We can not update the Standard Atomic Weight Table at this time based on these unpublished values but we can anticipate how many changes are probably going to be expected in the next few years on the basis of the forthcoming publication of the Atomic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 {sup 12}C 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 {sup 12}C.

• Research Organization: BROOKHAVEN NATIONAL LABORATORY (BNL)
• Sponsoring Organization: OFFICE OF NUCLEAR ENERGY, SCIENCE, & TECHNOLOGY
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 1027440
• Report Number(s): BNL--96212-2011-CP; KB0301041
• Country of Publication: United States
• Language: English

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