Les disciplines d'une Science (La Chimie).

Series : Encyclopedie scientifique, publiee sous la direction du Dr. Toulouse, Bibliotheque d'histoire et de philosophie des sciences, Directeur : A. Rey. Small 8vo. [2], [6], 324, [2], XIV pp. Original mustard-orange cloth with red & black stamped covers ; rubbed. Very good. [454] "In 1911 Urbain isolated another new element which he called "celtium", but his studies were interrupted by World War I. In 1922, he announced his new element, fully characterizing its emission spectrum, but mistakenly identifying it as a rare earth. George de Hevesy and Dirk Coster also characterized it, placing it more accurately, and called it "hafnium". A decades-long controversy over credit and naming was eventually decided in favor of hafnium. Although Urbain was right in detecting the presence of a new element, the spectra and the chemical behavior he described were not a good match to the element later isolated. In part, the controversy resulted from the different techniques used by chemists like Urbain, who favored chemical reduction techniques, and physicists who increasingly relied on new X-ray spectroscopy methods."

Product Info

Publisher: Octave Doin, Gaston Doin, 1921.

Year: 1921

Type: Used

Binding: Softcover

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