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(Russian: Дми́трий Ива́нович Менделе́ев, Dmitri Ivanovich Mendeleev ) (8 February [O.S. 27 January] 1834 in Tobolsk – 2 February [O.S. ] 1907 in Saint Petersburg), was a Russian chemist and inventor. He is credited as being the creator of the first version of the periodic table of elements. Unlike other contributors to the table, Mendeleev predicted the properties of elements yet to be discovered.
Dmitri Mendeleev was born in Tobolsk, Siberia, Russia on February 8,1834, to Ivan Pavlovich Mendeleev and Maria Dmitrievna Mendeleeva (born Kornilieva). His grandfather was Pavel Maximovich Sokolov, a Russian priest. Ivan, along with his brothers, obtained new family names while attending Tver theological seminary.
Mendeleev was the youngest child of 18 siblings.). At the age of 13, after the passing of his father and the destruction of his mother's factory by fire, Mendeleev attended the Gymnasium in Tobolsk.
In 1849, the now poor Mendeleev family relocated to St. Petersburg, where he entered the Main Pedagogical Institute in 1850. After he graduated, an illness that was diagnosed as tuberculosis caused him to move to the Crimean Peninsula on the northern coast of the Black Sea in 1855. While there he became chief science master of the Simferopol gymnasium №1. He returned with fully restored health to St. Petersburg in 1857.
Between 1859 and 1861, he worked on the capillarity of liquids and the workings of the spectroscope in Heidelberg. In late August of 1861 he wrote his first book on the spectroscope in which it received high acclaim. In 1862, he married Feozva Nikitichna Leshcheva. Mendeleev became Professor of Chemistry at the Saint Petersburg Technological Institute and the University of St. Petersburg in 1863 he achieved tenure in 1867, and by 1871 had transformed St. Petersburg into an internationally recognized center for chemistry research. In 1865 he became Doctor of Science for his dissertation "On the Combinations of Water with Alcohol". In 1876, he became obsessed with Anna Ivanova Popova and began courting her; in 1881 he proposed to her and threatened suicide if she refused. His divorce from Leshcheva was finalized one month after he had married Popova in early 1882. Even after the divorce, Mendeleev was technically a bigamist; the Russian Orthodox Church required at least 7 years before lawful re-marriage. His divorce and the surrounding controversy contributed to his failure to be admitted to the Russian Academy of Sciences (despite his international fame by that time). His daughter from his second marriage, Lyubov, became the wife of the famous Russian poet Alexander Blok. His other children were son Vladimir (a sailor, he took part in the notable Eastern journey of Nicholas II) and daughter Olga, from his first marriage to Feozva, and son Ivan and a pair of twins from Anna.
Though Mendeleev was widely honored by scientific organizations all over Europe, including the Copley Medal from the Royal Society of London, he resigned from St. Petersburg University on August 17, 1890.
In 1893, he was appointed Director of the Bureau of Weights and Measures. It was in this role that he was directed to formulate new state standards for the production of vodka. His fascination with molecular weights led him to conclude that to be in perfect molecular balance, vodka should be produced in the ratio of one molecule of ethyl alcohol diluted with five molecules of water, giving a dilution by volume of approximately 38% alcohol to 62% water. As a result of his work, in 1894 new standards for vodka were introduced into Russian law and all vodka had to be produced at 40% alcohol by volume.
Mendeleev also investigated the composition of oil fields, and helped to found the first oil refinery in Russia.
After becoming a teacher, he wrote the definitive two-volume textbook at that time: Principles of Chemistry (1868-1870). As he attempted to classify the elements according to their chemical properties, he noticed patterns that led him to postulate his Periodic Table.
Unknown to Mendeleev, several other scientists had also been working on their own tables of elements. One was John Newlands, who published his Law of Octaves in 1865. However, the lack of spaces for undiscovered elements and the placing of two elements in one box were criticised and his ideas were not accepted. Another was Lothar Meyer, who published a work in 1864, describing 28 elements. Like Newlands, Meyer did not seem to have the idea of using a table to predict new elements. In contrast to Newlands' methodical approach to creating a table, Mendeleev's was almost accidental and emerged gradually.
As a better understanding of atomic mass was developed and better data became available, Mendeleev made for himself the following table:
By adding additional elements following this pattern, he developed his version of the periodic table.
On March 6, 1869, Mendeleev made a formal presentation to the Russian Chemical Society, entitled The Dependence between the Properties of the Atomic Weights of the Elements, which described elements according to both weight and valence. This presentation stated that
Only a few months after Mendeleev published his periodic table of all known elements (and predicted several new elements to complete the table), Meyer published a virtually identical table. Some people consider Meyer and Mendeleev the co-creators of the periodic table, although most agree that Mendeleev's accurate prediction of the qualities of what he called ekasilicon (germanium), ekaaluminium (gallium) and ekaboron (scandium) qualifies him for deserving the majority of the credit for studies.
As others before him had done, he questioned the accuracy of accepted atomic weights, pointing out that they did not correspond to those predicted by the Periodic Law. He noted that tellurium has a higher atomic weight than iodine, but he placed them in the correct order, assuming that the accepted atomic weights at the time were incorrect. He was puzzled about where to put the known lanthanides, and predicted the existence of another row to the table, the actinides, which were some of the heaviest in atomic mass.
Some people laughed at Mendeleev for predicting that there would be more radioactive liquids, but he was right when Ga (Gallium) and Ge (Germanium) were found in the future fitting perfectly into the two missing spaces. 
Mendeleev made other important contributions to chemistry. The Russian chemist and science historian L.A. Tchugayev has characterized him as "a chemist of genius, first-class physicist, a fruitful researcher in the fields of hydrodynamics, meteorology, geology, certain branches of chemical technology (explosives, petroleum, and fuels, for example) and other disciplines adjacent to chemistry and physics, a thorough expert of chemical industry and industry in general, and an original thinker in the field of economy." Mendeleev was one of the founders, in 1869, of the Russian Chemical Society. He worked on the theory and practice of protectionist trade and on agriculture.
In an attempt at a chemical conception of the Aether, he put forward a hypothesis that there existed two inert chemical elements of lesser atomic weight than hydrogen. Of these two proposed elements, he thought the lighter to be an all-penetrating, all-pervasive gas, and the slightly heavier one to be a proposed element, coronium.
In another department of physical chemistry, he investigated the expansion of liquids with heat, and devised a formula similar to Gay-Lussac's law of the uniformity of the expansion of gases, while as far back as 1861 he anticipated Thomas Andrews' conception of the critical temperature of gases by defining the absolute boiling-point of a substance as the temperature at which cohesion and heat of vaporization become equal to zero and the liquid changes to vapor, irrespective of the pressure and volume.
Mendeleev is given credit for the introduction of the metric system to the Russian Empire.
He invented pyrocollodion, a kind of smokeless powder based on nitrocellulose. This work had been commissioned by the Russian Navy, which however did not adopt its use. In 1892 Mendeleev organized its manufacture.
Mendeleev studied petroleum origin and concluded that hydrocarbons are abiogenic and form deep within the earth. He wrote: "The capital fact to note is that petroleum was born in the depths of the earth, and it is only there that we must seek its origin." (Dmitri Mendeleev, 1877)
References and external links
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Dmitri_Mendeleev". A list of authors is available in Wikipedia.|