Russian chemist who arranged the 63 known elements into a periodic table based on atomic mass, which he published in Principles of Chemistry in 1869. This organization surpassed attempts at classification by Beguyer de Chancourtois and Newlands and was published a year before the work of Lothar Meyer. Mendeléev left space for new elements, and predicted three yet-to-be-discovered elements including eka-silicon and eka-boron. His table did not include any of the noble gases , however, which had not yet been discovered. His table placed elements in their correct position by atomic number, thus showing variance from atomic weight in a number of places.

Beguyer de Chancourtois, Döbereiner, Dumas, Meyer, Newlands