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Pure Appl. Chem., Vol. 68, No.12, pp. 2339-2359, 1996

INORGANIC CHEMISTRY DIVISION

COMMISSION ON ATOMIC WEIGHTS AND ISOTOPIC ABUNDANCES

Atomic Weights of the Elements 1995

 

Prepared for publication by T.B. Coplen (USA)

> Web version (html format)
> Updated version (including periodic table) prepared by G. P. Moss

Synopsis : The biennial review of atomic weight, determinations and other cognate data has resulted in changes for the standard atomic weight of the following elements: boron, carbon, fluorine, sodium, aluminium, phosphorus, scandium, manganese, cobalt, arsenic, rhodium, caesium, cerium, praseodymium, europium, terbium, holmium, thulium, platinum, gold, and bismuth.

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 7Li/6Li ratios and that reporting using 6Li/7Li ratios be discontinued. Because relative isotope-ratio data for sulfur are commonly being expressed on non-corresponding scales, the Commission recommends that such isotopic data be expressed relative to VCDT (Vienna Caņon Diablo Troilite) on a scale such that 34S/32S of IAEA­S­1 silver sulfide is 0.9997 times that of VCDT. Many elements have a different isotopic composition in some non­terrestrial materials. Some recent data on of oxygen are included in this report for the information of the interested scientific community.


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