This is the first 1,000 characters of 488 words (1.95 pages) in the essay titled Gallium
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 gallium. Its properties closely
match those predicted by Mendelev.
Gallium, atomic number 31, is very similar to aluminum in its chemical
properties. It does not dissolve in nitric acid because of the protective film
of gallium oxide that is formed over the surface by the action of the acid.
Gallium does however dissolve in other acids, and alkalies.
Gallium was discovered (1875) by Paul Emile Lecoq de Boisbaudran, who
observed its principal spectral lines while examining material seperated from
zinc blende. Soon after he isolated the metal studied its properties, which
coincided those that Dmitrii Ivanovich Mendelev had predicted a few years
earlier for eka-aluminium, the then undiscovered element lying between aluminum
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