Dmitri Mendeleev — Russian Scientist born on February 08, 1834, died on February 02, 1907

Dmitri Ivanovich Mendeleev was a Russian chemist and inventor. He formulated the Periodic Law, created his own version of the periodic table of elements, and used it to correct the properties of some already discovered elements and also to predict the properties of eight elements yet to be discovered... (wikipedia)

It is the function of science to discover the existence of a general reign of order in nature and to find the causes governing this order. And this refers in equal measure to the relations of man - social and political - and to the entire universe as a whole.
I want you to have this feeling too - it is my moral responsibility to help you achieve this inner freedom.
There exists everywhere a medium in things, determined by equilibrium.
The elements, if arranged according to their atomic weights, exhibit an apparent periodicity of properties.
The elements which are the most widely diffused have small atomic weights.