HISTORY OF PERIODIC TABLE
Category: Scienza
è stato aggiornato: 9 mesi fa
chem, 10 science, raissa
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Created byRaissa Caiannika
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Johann Wolfgang Döbereiner
(TRIADS; he placed three elements into groups called triads)John Alexander Reina Newlands
(OCTAVES; He devised a periodic table of chemical elements
arranged in order of their relative atomic masses)Lothar Meyer
(TABLE; He published articles about classification table of the elements in horizontal form (1864) and vertical form (1870),
in which the series of periods are properly ended by an element of the alkaline earth metal group.)Dmitri Mendeleev
(TABLE; He described elements according to both atomic weight (now called
relative atomic mass) and valence.)John William Strutt, 3rd Baron Rayleigh (NOBLE GAS)
He, along with William Ramsay, succeeded in extracting the
previously unknown element, argon, in pure form and in analyzing its properties.William Ramsay (NOBLE GAS)
He discovered helium, which since 1868 had been known to exist, but only in the sun. This second discovery led him to
suggest the existence of a new group of elements in the periodic table. He and his coworkers quickly isolated neon, krypton, and xenon from the earth’s atmosphere.Henry Moseley (TABLE)
He arranged the elements in the periodic table according to atomic numbers. He realized his findings indicated that the identity
of an element is how many protons it has. The number of protons represents the atomic number of an element.Glenn Seaborg (ACTINIDES AND LANTHANIDES)
Seaborg was the principal or co-discoverer of ten elements: plutonium, americium, curium, berkelium, californium, einsteinium, fermium, mendelevium, nobelium and element 106, which, while he was still living, was named seaborgium in his honor.
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