GALLIUM • DICCIONARIO INGLES.COM • Definition of Gallium

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/gˈæliəm/ Listen

noun

Gallium n. (Chem.) A rare metallic element, found combined in certain zinc ores. It is white, hard, and malleable, resembling aluminium, and remarkable for its low melting point (86° F., 30° C.). Symbol, Ga; at. wt., 69.9. Gallium is chiefly trivalent, resembling aluminium and indium. It was predicted with most of its properties, under the name eka-aluminium, by the Russian chemist Mendelyeev on the basis of the periodic law. This prediction was verified in its discovery (in 1875) by the French chemist Lecoq de Boisbaudran by its characteristic spectrum (two violet lines), in an examination of a zinc blende from the Pyrenees.

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Etymology of 'Gallium'

Collaborative International Dictionary of English 0.48

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"Gallium" Quotes from Famous Books

... sword of office in his hand, his ducal robe on his imposing form, and with that peculiarly erect air of the head which he assumed upon all ceremonial occasions [203]. Behind him stood Odo of Bayeux, in aube and gallium; some score of the Duke's greatest vassals; and at a little distance from the throne chair, was what seemed a table; or vast chest, covered all over ...

— Harold, Complete - The Last Of The Saxon Kings • Edward Bulwer-Lytton

... under other hypothetical conditions, and in this way many important discoveries have been made. For instance it was in this way that Mendeleef, the Russian chemist, assumed the existence of three then unknown chemical elements, now called Scandium, Gallium and Germanium. There was a gap in the orderly sequence of the chemical elements, and relying on the old maxim—"Natura nihil facit per saltum"—Nature nowhere leaves a gap to jump over—he argued that if such elements did not exist they ought to, and ...

— The Law and the Word • Thomas Troward

... view here presented rests in the main on the comparatively trustworthy account in the Epitome of Livy (where we should read -reversi in Gallium in Vellocassis se Teutonis coniunxerunt) and in Obsequens; to the disregard of authorities of lesser weight, which make the Teutones appear by the side of the Cimbri at an earlier date, some of them, such ...

— The History of Rome (Volumes 1-5) • Theodor Mommsen

... stratum of carbon-vapour was, in 1897, detected in the chromosphere by Professor Hale with a grating-spectroscope attached to the 40-inch Yerkes refractor.[623] The eclipse-photographs of 1893 disclosed to Hartley's examination the presence there of gallium;[624] and those taken by Evershed in 1898 were found by Jewell[625] to be crowded with ultra-violet lines of the equally rare metal scandium. The general rule had been laid down by Sir Norman Lockyer that the metallic radiations from the chromosphere are ...

— A Popular History of Astronomy During the Nineteenth Century - Fourth Edition • Agnes M. (Agnes Mary) Clerke