Ciaaw.org
IUPAC Commission on Isotopic Abundances and Atomic Weights
Official source for atomic weights and isotopic abundances, offering trusted data and updates for scientists, educators, and anyone interested in chemistry.
Find official atomic weights and isotopic data
The IUPAC Commission on Isotopic Abundances and Atomic Weights (CIAAW) is the global authority for official information on atomic weights and isotopic abundances of the chemical elements. If you're looking for accurate, up-to-date data in chemistry, this site provides comprehensive tables, reports, and reference materials trusted by scientists and educators worldwide.
You can explore detailed resources to support research, teaching, or simply satisfy your curiosity about the elements. The site is designed for anyone needing authoritative chemical data, with a history of international collaboration and rigorous scientific review. Whether you’re a professional chemist, a student, or just interested in the periodic table, you’ll find reliable information here.
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