Demetri Meneleev

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by isabellegoolsby
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Scientific Biographies
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Demetri Meneleev

Demetri Medeleev

While writing his textbook, Principles of Chemistry, Mendeleev found that if you arrange the elements in order of increasing atomic mass, their chemical properties demonstrated definite trends. This lead to his periodic table, which is the basis for the current periodic table of the elements. His table had blank spaces where he predicted three unknown elements which turned out to be germanium, gallium and scandium.

DOB: February 8th,1834DOD: February 2nd,1907From: RussiaHis family was unusually large: he may have had as many as 16 brothers and sisters, although the exact number is uncertain.

The reason Mendeleev became the leader of the pack was probably because he not only showed how the elements could be organized, but he used his periodic table to propose that some of the elements, whose behavior did not agree with his predictions, must have had their atomic weights measured incorrectly predict the existence of eight new elements. Mendeleev even predicted the properties these elements would have.

claim to fame

by: Isabelle Goolsby

Dmetri's life

Important contributions in science

The true insight that informed Mendeleev's work was shown not just in what he had included in the Periodic Table, but also in what he had left out. He did not assume that all elements were known. Where there was a significant gap in atomic weights between the elements in the table, he left a gap in the table. He posited that there were undiscovered elements that existed in the gaps and even predicted the characteristics of three of them.

Interesting facts

He spent most of the years 1859 and 1860 in Heidelberg, Germany, where he had the good fortune to work for a short time with Robert Bunsen at Heidelberg University. In 1860 Bunsen and his colleague Gustav Kirchhoff discovered the element cesium using chemical spectroscopy – a new method they had developed, which Bunsen introduced Mendeleev to.

Biography

Sadly his father lost his eyesight and subsequently lost his job so his mother had to work and endeavored to reinstate the family business of the glass factory previously abandoned.His father continued to deteriorate until he died when his son, Dmitri Mendeleev, was just thirteen years of age.

He met Anna Ivanova Popova in 1876 and proposed marriage, threatening to kill himself if she refused even though he was still legally married. One month before his divorce was finalized he was remarried, illegally. According to the Russian Orthodox Church seven years was required between a divorce and remarriage and this would have catastrophic effect on his career.

In 1905, the British Royal Society gave him its highest honor, the Copley Medal, and in the same year he was elected to the Royal Swedish Academy of Sciences.

On February 14, 1869, Mendeleev began work on the chapter that would discuss the elements. He already believed that there was some underlying principle connecting the elements. He transcribed his notes onto a set of cards, one for each element containing everything he knew about that element. He arranged and rearranged the cards until he was struck by a similarity between his arrangements

Mendeleev created the periodic table that we still use today. He was one of many to try, but the only to suceed. The reason for this is that he thought diffrently than others and even left room for new elements.


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