Dmitri Ivanovich Mendeleev was a Russian chemist who was born on February 8, 1834 in Tobolsk and died on February 2, 1907 in St. Petersburg. It is famous for the discovery of the underlying pattern in what is now known as periodic table of elements.
He devoted much of his life to studying the thermal expansion of the elements, the deviations of the real gases from what is already stated in the Boyle-Mariotte law.
He also achieved the discovery of the critical point and made a much more accurate formulation of the state equation.
However, his main investigation was the one that concluded with the enunciation of the periodic law of chemical elements, better known as Periodic table, and that was based on the periodic system that receives its name. With this table, Dmitri Mendeléyev managed to make a definitive classification of the elements.
The periodic system classifies all chemical elements, both natural and created, based on their atomic mass increasingly. In this way, those elements that have something in common are located in the same column. With this, he managed to get those elements with a similar chemical behavior to be located in the same column.
Likewise, Dmitri Mendeleev altered the order of the masses to order them according to their properties when he thought it necessary and, in addition, left blank gaps for new elements to be discovered in the future.
Its system incorporated multiple improvements in the classification of existing elements until then, such as the combination of atomic weights, or similarities between elements. In this way, he showed that the properties corresponding to chemical elements are periodic functions of their atomic weights.
A few years later, the periodic table of Mendeléyev's elements underwent a final expansion in one of its columns with the discovery of some noble gases such as neon or krypton, and which finalized the current version of the periodic table.
In Russia they never officially recognized their merits due to their liberal ideas, so they did not admit him to the Russian Academy of Sciences. However, Mendelevio (Md) was named in his honor to the chemical element of atomic number 101, in 1955.
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