How did the Karlsruhe International Chemistry Congress influence Dmitri Mendeleev?

The Karlsruhe International Chemistry Congress, held in September 1860, was a pivotal event for Dmitri Mendeleev. Mendeleev attended the congress while studying abroad in Heidelberg, and he later identified it as the major event that led him to discover the relationships between atomic weights and chemical properties.12

At the congress, Mendeleev met many of Europe's leading chemists and was particularly influenced by a paper circulated by the Italian chemist Stanislao Cannizzaro. Cannizzaro’s work clarified the concept of atomic weights, providing a consistent and robust theoretical structure that helped resolve the chaotic multiplicity of competing atomic weight systems of the time.23

By adopting this reformed set of atomic weights, Mendeleev was able to make sense of the chemical and physical properties of the elements, eventually leading to his formulation of the periodic law in 1869.45