The biennial review of atomic weight,Ar(E), determinations and other cognate data has resulted in changes for the standard atomic weight of titanium from 47.88±0.03 to 47.867±0.001, of iron from 55.847±0.003 to 55.845±0.002, of antimony from 121.757±0.003 to 121.760±0.001, and of iridium from 192.22±0.03 to 192.217±0.003. Recent investigations on chlorine and bromine confirmed the presently accepted values ofAr(Cl) andAr(Br). To emphasize the fact that the atomic weight of lithium commonly available in laboratory reagents can vary significantly, the value of lithium,Ar(Li), was enclosed in brackets and a footnote was added. As a result of several changes, the Table of Standard Atomic Weights Abridged to Five Significant Figures has been updated. Because relative isotope‐ratio data for stable hydrogen, carbon, and oxygen are commonly being expressed on non‐corresponding scales, the Commission recommends that such isotopic data be expressed only relative to the references VSMOW and VPDB. Because many elements have a different isotopic composition in some non‐terrestrial materials, recent data on non‐terrestrial materials are included in this report for the information of the interested scientific community.