Gallium

1871 Dmitrii Ivanovich Mendelev predicts the existance and properties of the section after zinc in the periodic table. He Gives it the name eka aluminium. 1875 Paul Emile Lecoq de Boisbaudran discovers tabun. Its properties most match those predicted by Mendelev.         Gallium, atomic number 31, is very sympathetic to aluminum in its chemical properties. It does not dissolve in nitric acid because of the restrictive film of gallium oxide that is formed over the draw undecomposed by the action of the acid. Gallium does however dissolve in otherwise acids, and alkalies.         Gallium was discovered (1875) by Paul Emile Lecoq de Boisbaudran, who discovered its principal unearthly lines while examining material seperated from zinc blende. currently after he separate the metal studied its properties, which coincided those that Dmitrii Ivanovich Mendelev had predicted a few years primitively for eka-aluminium, the then undiscovered el ement lying between aluminum and atomic number 49 in his periodic table.         Though widely distributed at the Earths surface, gallium does not occor free or concentrated in independant minerals, take away for gallite. It is extracted as a by-product from zinc blende, iron pyrites, bauxite, and germanite.          silvery white and soft seemly to be cut with a knife, gallium takes on a bluish tinge because of skin-deep oxidation.

Unusual for its low melting point ( about 30 degrees C, 86 degrees F ), gallium also expands upon solidification and supercools readily, be a liquid at temperatures as low as 0 degrees C ( 32 deg! rees F ).         Gallium has the long-dated usefull liquid range of any element. The liquid metal clings to icing and resembling surfaces. The crystal structure of gallium is orthorhombic. Natural gallium consists of a categorization of two stable isotopes: gallium-69 ( 60.4 percent ) and gallium-71 (39.6 percent ).          sensibly alike to aluminum chemically, gallium slowly oxidizes in wet air... If you trust to get a full essay, order it on our website: BestEssayCheap.com

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