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Dmitri Ivanovich Mendeleev
Transcript of Dmitri Ivanovich Mendeleev
Mendeleev was born in Tobolsk, Siberia, on January 27, 1834. He was the youngest of seventeen children. His interest in mathematics and physics was evident in his childhood. His mother felt that he should have the best education possible since she foresaw his contributions to these subjects.
¨He realized that the physical and chemical properties of elements were related to their atomic mass in a 'periodic' way, and arranged them so that groups of elements with similar properties fell into vertical columns in his table." When using this method there would often times be gaps in the rows. Other scientists would view this as problem but Mendeleev did not. He just thought that the elements had yet to be discovered. Him thinking in this different way is what allowed him to have a breakthrough because he did not let the missing elements hinder his process of inventing the periodic table.
Dmitri Ivanovich Mendeleev
Mendeleev is the founding father of the modern periodic table and of the periodic law (way the table is arranged). It is still in use today, with slight modifications to accommodate the new elements discovered and with the elements in order of atomic number. Through his table, he was able to predict the properties of missing elements well before they were observed. Furthermore, Russia's prestige increased due to his work.
In 1880 fellow academics proposed him for the chair of chemical technology at the Imperial Academy of Sciences, but his candidacy was opposed by a number of influential individuals and ultimately rejected. He resigned from his university chair ten years later. His work was largely ignored at first, even by his Russian contemporaries. But as new elements were discovered (he accurately predicted their properties) and fit perfectly into the table, the periodic table became widely accepted.
The periodic table, possibly his own renowned discovery, had a rather obvious impact on the world. The periodic table set the foundation for chemistry as it helped explain the long-term mystery of atoms and helped organize the basis of the subject. Chemistry, the study of substances, basically has to deal with our origins. By discovering the periodic table, we were thus able to answer the question of where we came from. Chemistry also led to multiple technological advances such as the atom bomb and nuclear science.
Before Mendeleev, there have been small advancements in the organization of elements. However, these advancements were rudimentary and crude. These early chemists found patterns, but they often did not apply to the whole list of elements (there was no periodic table).
Chemistry before Mendeleev
¨Pleasures flit by - they are only for yourself; work leaves a mark of long lasting joy, work is for others.¨
-Dmitri I. Mendeleev
¨Certain characteristic properties of elements can be foretold from their atomic weights.¨
¨We must expect the discovery of many as yet unknown elements-for example, elements analogous to aluminum and silicon- whose atomic weight would be between 65 and 75. ¨
¨No one nor anything can silence me.¨
¨There is nothing in this world that I fear to say.¨