Gallium

1871 Dmitrii Ivanovich Mendelev predicts the existance and properties of the factor after zinc in the periodic table. He Gives it the name eka aluminium. 1875 Paul Emile Lecoq de Boisbaudran discovers atomic number 31. Its properties most match those predicted by Mendelev.         Gallium, nuclear number 31, is very sympathetic to aluminum in its chemical properties. It does not dissolve in nitric acid because of the preventative film of gallium oxide that is formed over the draw uprise 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 spy its principal unearthly lines while examining material seperated from zinc blende. shortly 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 element 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, further for gallite. It is extracted as a by-product from zinc blende, iron pyrites, bauxite, and germanite.          euphonous white and soft seemly to be cut with a knife, gallium takes on a bluish tinge because of footling 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 tempe ratures as low as 0 degrees C ( 32 degrees F! ).         Gallium has the long usefull liquid range of any element. The liquid metal clings to glass in 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 ).          close to 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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