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Gallium
Beginning of Essay
1871 Dmitrii Ivanovich Mendelev predicts the existance and properties of the
element after zinc in the periodic table. He Gives it the name "eka aluminium".
1875 Paul Emile Lecoq de Boisbaudran discovers . Its properties closely
match those predicted by Mendelev.
.... Middle of Essay
.... occor
free or concentrated in independant minerals, except for gallite. It is
extracted as a by-product from zinc blende, iron pyrites, bauxite, and
germanite.
Silvery white and soft enough to be cut with a knife, gallium takes on a
bluish tinge because of superficial oxidation. Unusual for its low melting
point ( about 30 degrees C, 86 degrees F ), gallium also expands upon
solidification and supercools readily, remaining a liquid at temperatures as
low as 0 degrees C ( 32 degrees F ).
Gallium has the longest usefull liquid range of any element. The liquid
metal clings to glass and similar surfaces. The crystal structure of gallium
is ortho ....
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Words: 487 - Pages: 2
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