Where was the periodic table first publicly presented in modern form?

Dmitri Mendeleev is credited with creating the first widely accepted periodic table, which he published in 1869 in Russia. He arranged elements by atomic mass and repeating chemical properties, leaving gaps for elements not yet discovered. His predictions for elements such as gallium and germanium were later confirmed, which helped establish the table’s credibility. The modern table is now ordered by atomic number, but Mendeleev’s insight remains foundational. His work transformed chemistry into a more systematic and predictive science.