DmitriMendeleevB6

Dmitri Mendeleev was a Russian chemist born in Tobolsk, Siberia. He contributed to modern science by creating the first periodic table by arranging elements by atomic weight and similar properties. His first periodic table was published in 1869. He predicted that there were to be existant and left gaps within the table for other elements that were still to be discovered. Mendeleev and other chemists could determine the atomic weight of each element comparing them to the atom Hydrogen which was the lightest element.
 * ​Dmitri Mendeleev **