Atomic weights of the elements 1983
1984; International Union of Pure and Applied Chemistry; Volume: 56; Issue: 6 Linguagem: Inglês
10.1351/pac198456060653
ISSN1365-3075
Autores Tópico(s)Astronomical and nuclear sciences
ResumoThe biennial review of atomic weight, &(E), determinations and other cognate data have resulted in the following changes in recommended values (1981 values in parentheses): Helium 4.002602 ± 2 (4.00260 ± 1); Lithium 6.941 ± 2 (6.941 ± 3); Boron 10.811 ± 5 (10.81 ± 1); Sulfur 32.066 ± 6 (32.06 ± 1); Calcium 40.078 ± 4 (40.08 ± 1); Scandium 44.95591 ± 1 (44.9559 ± 1); Chromium 51.9961 ± 6 (51.996 ± 1); Zinc 65.39 ± 2 (65.38 ± 1); Gallium 69.723 ± 4 (69.72 ± 1); Zirconium 91.224 ± 2 (91.22 ± 1); Ruthenium 101.07 ± 2 (101.07 ± 3); Tin 118.710 ± 7 (118.69± 3).These values are incorporated in the Table of Standard Atomic Weights of the Elements 1983.The Table lists estimated uncertainties between ±1 and ±9 in the last tabulated figure, which represents a departure from the practice in prior years of restricting uncertainties to two alternative values, either ±1 or ±3.Annotations in Tables 1 and2 have been changed for several of the elements and element 107 is included in the table of Relative Atomic Masses and Half-Lives of Selected Radionuclides for the first time.The Report summarizes those elements of mom-terrestrial origin for which variations in isotopic composition have been found and categorizes them by their cause from mass fractionation, nuclear reactions or solar wind.
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