Organizations & People
Pure Appl. Chem.,
Vol. 68, No.12, pp. 2339-2359, 1996
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.
Page last modified 7 October 1999.
Copyright ©1999 International Union of Pure and Applied Chemistry.
Questions or comments about IUPAC, please contact, the Secretariat.
Questions regarding the website, please contact Web