The atomic weights are available for elements 1 through 111, and isotopic compositions or abundances are given when appropriate. The atomic weights data were published by T. B. Coplen in Atomic Weights of the Elements 1995, J. Phys. Chem. Ref. Data, 26 (5), 1239 (1997) and the isotopic compositions data were published by K. J. R. Rosman and P. D. P. Taylor in Isotopic Compositions of the Elements 1997, J. Phys. Chem. Ref. Data, 27 (6), 1275 (1998). One should note that the isotopic compositions data are not based on Atomic Weights of the Elements 1995 but on another report that is soon to be published, Atomic Weights of the Elements 1997.