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Барий

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Барий

 
Atomic number   56
Atomic mass     137.33 < / div>
Density, kg / m?   3500
Temperature
melting, ° С       729
 
Barium is a soft, malleable, silvery-white alkaline earth metal. has a high chemical activity. The nuclear fission of uranium and plutonium produces the radioactive isotope Ba, which is used as a radioactive indicator. Barium was discovered by the Swedish chemist K. Scheele (1774) in the form of BaO oxide, called "heavy earth", or barite (from the Greek. Barys - heavy). Metallic barium was obtained by the English chemist G. Davy (1808) by electrolysis of wet hydroxide with a mercury cathode. The content of barium in the earth's crust is 0.05% by weight, in a free state it does not occur in nature. Of the barium minerals, barite (heavy spar) and less common witherite are of industrial importance.
 

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