Atomic weights of the elements 1995

The biennial review of atomic weight, A(r)(E), determinations and other cognate data has resulted in changes for the standard atomic weight of the following elements: [GRAPHICS] An annotation for potassium has been changed in the Table of Standard Atomic Weights. To eliminate possible confusion in the reporting of relative lithium isotope-ratio data, the Commission recommends that such data be expressed using Li-7/Li-6 ratios and that reporting using Li-6/Li-7 ratios be discontinued. Because relative isotope-ratio data for sulfur are commonly being expressed on noncorresponding scales, the Commission recommends that such isotopic data be expressed relative to VCDT (Vienna Canon Diablo Troilite) on a scale such that S-34/S-32 of IAEA-S-1 silver sulfide is 0.9997 times that of VCDT. Many elements have a different isotopic composition in some non-terrestrial materials. Some recent data on of oxygen are included in this report for the information of the interested scientific community.