Who was the Russian who was a pioneer in the development of the periodic law?

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Mendeleev is widely considered the pioneer in the development of the periodic law. He created the first version of the periodic table in 1869, organizing the elements based on their atomic weight and chemical properties, and left blank spaces for yet-unknown elements that he predicted would exist based on the patterns in the table. His work laid the foundation for our modern understanding of the organization of the elements.

Who Was the Russian Who Was a Pioneer in the Development