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Britannica Book of the Year (1913, 1938-) The Britannica book of the war (1914) Britannica Home University (1920) Weedon's Modern Encyclopedia (1931) a non-Britannica publication that was bought out and repackaged by Britannica as Britannica Junior (1934) Great Books of the Western World (1952) Children's Britannica (1960) aimed at ages seven ...
Gallium trichloride is a common starting reagent for the formation of organogallium compounds, such as in carbogallation reactions. [15] Gallium trichloride reacts with lithium cyclopentadienide in diethyl ether to form the trigonal planar gallium cyclopentadienyl complex GaCp 3. Gallium(I) forms complexes with arene ligands such as ...
Gallium does not occur as a free element in nature, but rather as gallium(III) compounds in trace amounts in zinc ores (such as sphalerite) and in bauxite. Elemental gallium is a liquid at temperatures greater than 29.76 °C (85.57 °F), and will melt in a person's hands at normal human body temperature of 37.0 °C (98.6 °F).
China on Tuesday banned exports to the United States of the critical minerals gallium, germanium and antimony that have widespread military applications, escalating trade tensions the day after ...
A & C Black is a British book publishing company, owned since 2002 by Bloomsbury Publishing. The company is noted for publishing Who's Who since 1849 and the Encyclopædia Britannica between 1827 and 1903. [1] [2] It offers a wide variety of books in fiction and nonfiction, and has published popular travel guides, novels, and science books.
Encyclopædia Britannica, Inc. initially owned Compton's Encyclopedia from 1961 to 1993, and later reacquired it in 2002. Britannica had sold its Compton's interests to the Tribune Company in 1993, and for a time Compton's Encyclopedia was a product of The Learning Company, which purchased Broderbund in 1998.
Bauxite is the main source of the rare metal gallium. [17] During the processing of bauxite to alumina in the Bayer process, gallium accumulates in the sodium hydroxide liquor. From this it can be extracted by a variety of methods. The most recent is the use of ion-exchange resin. [18]
The project for the Great Books of the Western World began at the University of Chicago, where the president, Robert Hutchins, worked with Mortimer Adler to develop there a course of a type originated by John Erskine at Columbia University in 1921, with the innovation of a "round table" approach to reading and discussing great books among professors and undergraduates.