DMITRI IVANOVICH MANDELEEV

Dmitri Ivanovich Mandeleev was a russian chemist and a inventor. He formulated the predoic law, created his own version of predoic table of elements. He used to correct the properties of already discovered elements and also predict the properties of elements yet to be discovered.

Mandeleev was born in the village of Verkhnie Aremzyani in Siberia. Then he was sent to his grand parrents who lived in Russia. He was thought to be youngest of all the siblings. Despite being raised as a orthodox christian, he later rejected the religion and embraced a from of desim.

Mandeleev graduate in chemistry and Between 1859 and 1861, he worked on cliparity of liquids and the workings of spectroscope. He also wrote a book on spectroscope. On 4 april 1862 he became engaged to Feozva nikitichana leshcheva and later got married. Mandeleev became a professor of saint Petersburg Technological institute and saint Petersburg state university respectively. He became a doctor of science. In 1876 mandeleev became obsessed with Anna Ivanova popova. He divorced his first wife and got married with Popova. All together Mandeleev has four childeren.

THE CREATION OF PREIODIC TABLE

Mandeleev was a renouned teacher. And during that time there was no good text books for the students. So Mandeleev decided to write text books for the students. Mandeleev tried to classify elements accoding to their chemical properties. In 1869 he published his version of what become known as predoic table. Later he published an improved version of predoic table in which he left gaps of the elements that were not yet known. His chart and theories gained acceptance among everyone and other scientist's.

HOW MANDELEEV CREATED THE PREIODIC TABLE?

MANDELEEV'S METHOD OF CREATING THE PREIODIC TABLE

• At first he weighted the atomic mass of the elements.
• Then he arranged them in the form lowest to the highest.
• He put them in the same coloumn if they have the same chemical properties.
• He didn't know that the last group noble gas exists because they have no reaction.
• He also left gaps of the elements that he knew exists but wasn't discovered yet.

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Mandeleev also did experiments on chemical theory of solution, thermal expansion of liquids and the nature of petrolium. In 1980 he resigned from the university because of progessive political views and his advocacy of social reforms. After that he became the director of the bureau of weights and measures in saint Petersburg and held this position until his death in1907.

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