Volpedo, 2016, February 8

For the 182 anniversary of Dmitrij Mendeleev's birth, the man who invented the periodic table, Google wanted celebrate the scientist with an elegant doodle. In 1975, Primo Levi called his periodic table as a poem.

Who was Dmitrij Mendeleev?
We all know the periodic table: the famous table ordering all chemical elements according to the protons contained in the nucleus of their atom. But maybe not all of us know the name of its inventor, Dmitry Mendeleev and how it was born.
Dmitry was born in 1834 in Tobolsk, in Siberia, the last of at least fourteen children. In 1867, at 33 yeard old, recently a professor at the University of St. Petersburg, Mendeleev was grappling with the drafting of a manual on the principles of chemistry. He realized immediately that the inexperienced user may have missed: you had to clearly organize the various elements and their properties.

Mendeleev worked for months to the table, pinning the name and the characteristics of each element of some sheets and placing them in a different way as in solitary. The result of these joints was reported on a table on a page, modified by Mendeleev several times until the release of the 1871 version with horizontal arrangement similar to that still used. The periodic table as we know it today is the result of an integration of research and Mendelev Meyer of the German scholar. Other chemists had noticed the regular recurrence of certain properties by the atomic weight and tried different classifications, but only Mendeleev was able to clearly formulate the law of property of the atomic weight and sort items into groups and periods.

Because the periodic table is so important?
It was used to group the items known by certain characteristics, but also to predict the existence and properties of metals and unknown gases. The scientist was firmly convinced that in nature there were other elements. Some boxes were empty: in 1875 it was discovered gallium, scandium in 1879 and in 1886 germanium.

How many great minds, for his reformist ideas was opposed by zar. He died in 1907, ten years before the Russian Revolution, after renewing the Russian system of measurement units.
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