Atomic Weights and Isotopic Compositions with Relative Atomic Masses List data for all or individual elements More information is available at physics.nist.gov/PhysRefData/Compositions/index.html Department of Commerce (DOC)-National Institutes of Standards and Technology (NIST) The atomic weights are available for elements 1 through 111, and isotopic compositions or abundances are given when appropriate. The data includes Isotope: Atomic number, Symbol, and Mass number; Representative Isotopic Composition (%): Mole fraction of the various isotopes; and Standard Atomic Weight (common usage) Keywords: Chemistry-General Resource tags: Data; Online searching of information; Resources for science professionals Beginning of Bottom Navigation Links | About
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