Dmitri Mendeleev (Dmitriy Ivanovich Mendeleyev)

Dmitri Mendeleev was a Russian chemist best known for creating the periodic table of elements in 1869. He organized elements based on their atomic weights and properties, which revealed patterns and allowed him to predict the existence of elements not yet discovered. His work provided a systematic framework that helps scientists understand how elements behave and relate to each other, significantly advancing the field of chemistry. Mendeleev's periodic table remains foundational in understanding the elements that make up everything around us.