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Compounds containing Ga–Ga bonds are true gallium(II) compounds, such as GaS (which can be formulated as Ga 2 4+ (S 2−) 2) and the dioxan complex Ga 2 Cl 4 (C 4 H 8 O 2) 2. [1] There are also compounds of gallium with negative oxidation states, ranging from -5 to -1, most of these compounds being magnesium gallides (Mg x Ga y).
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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).
My First Britannica is aimed at children ages six to 12, and the Britannica Discovery Library is for children aged three to six (issued 1974 to 1991). [51] Compton's by Britannica, first published in 2007, incorporating the former Compton's Encyclopedia, is aimed at 10- to 17-year-olds and consists of 26 volumes and 11,000 pages. [52]
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.
The Know-It-All: One Man's Humble Quest to Become the Smartest Person in the World is a book by Esquire editor A. J. Jacobs, published in 2004. [1]It recounts his experience of reading the entire Encyclopædia Britannica; all 32 volumes of the 2002 edition, extending to over 33,000 pages with some 44 million words.
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.
As Ga will not react with N 2 below 1000 °C, the powder must be made from something more reactive, usually in one of the following ways: 2 Ga + 2 NH 3 → 2 GaN + 3 H 2 [61] Ga 2 O 3 + 2 NH 3 → 2 GaN + 3 H 2 O [62] Gallium nitride can also be synthesized by injecting ammonia gas into molten gallium at 900–980 °C at normal atmospheric ...