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Example sentences for: mendeleev
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The categorization of all the known elements of the day by the Russian scientist Dmitri Ivanovich Mendeleev (1834-1907) represents an instance of genius in nomenclature and classification.
The history of the discovery and naming of the lanthanides (the fourteen rare-earth elements with atomic numbers 58 to 71 in Mendeleev's table) is fascinating.
Not only did Mendeleev notice that the elements could be grouped together in a chart that related their atomic numbers (the number of neutrons in the nucleus of their base isotope), but he also saw that this relationship grouped together elements with similar chemical characteristics.
Mendeleev's insight was so valuable that when radioactive elements began being synthesized in laboratories during this century, he got one named after him: Mendelevium—note the dropping of the final e!—the 101st element (symbol Md), first synthesized in 1955.
Four decades later, Dmitri Mendeleev systematized the table to show stacks of elements with similar properties (e.g. the interchangeability of the numbers of hydrogen, lithium, sodium and potassium atoms in molecules such as sulfates and hydroxides: The sodium atom in lye—NaOH—could just as well be replaced by a second hydrogen, making hydrogen hydroxide—HOH, better known as H2O, or water).