Atomic weights of the elements 1983

Abstract

The biennial review of atomic weight, Ar(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 and 2 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 non-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. © 1984, Walter de Gruyter. All rights reserved.