Chemist Dmitri Mendeleev

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Dmitri Mendeleev, whose full name is Dmitry Ivanovich Mendeleyev, was a Russian chemist who developed the periodic classification of the elements. He was born on January 27, 1834, in Tobolsk, Siberia, Russian Empire, and died on January 20, 1907, in St. Petersburg, Russia. When all of the known chemical elements were ordered in increasing atomic weight order, Mendeleev discovered that the resulting table revealed a repeating sequence, or periodicity, of properties within groups of elements. He left holes in areas where he thought unknown elements would find their location in his 1871 edition of the periodic table. He also estimated the properties of three of the most powerful drugs.


His life

Mendeleev was born as the last of 14 living children (or 13 depending on the source) of Ivan Pavlovich Mendeleev, a local gymnasium teacher, and Mariya Dmitriyevna Kornileva in the small Siberian town of Tobolsk. Dmitri's father went blind the year he was born, and he died in 1847. His mother took to running a small glass factory operated by her relatives in a nearby town to help support the family. Dmitri's mother brought him to St. Petersburg after the factory burnt down in December 1848, where he studied in the Main Pedagogical Institute. Mendeleev graduated in 1855, shortly after his mother died. He got his first teaching job in Crimea, in Simferopol. He didn't go.




His achievements

Mendeleev struggled to find a textbook that matched his needs when he started teaching inorganic chemistry. He set out to write another textbook on organic chemistry after receiving the coveted Demidov Prize for his previous one in 1861. The outcome was Osnovy khimii (1868–71; The Principles of Chemistry), which went through several editions and translations before becoming a classic. When Mendeleev started writing the chapter on the halogen elements (chlorine and its analogues) at the end of the first book, he compared the properties of this group of elements to the properties of the alkali metals like sodium. He finds himself in the middle of these two sets of elements that are diametrically opposed.


Periodic Table

In March 1869, he presented his newly proposed law to the Russian Chemical Society, stating that “elements grouped according to the value of their atomic weights show a simple periodicity of properties.” Mendeleev's law allowed him to compile a comprehensive table of all 70 elements known at the time. He was so convinced of the periodic law's significance that he made modifications to widely agreed atomic weight values for a few elements and estimated the positions of missing elements in the periodic table, as well as their properties. Chemists were initially uninterested in the periodic system. However, the discovery of the predicted elements, especially gallium, has changed everything.


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