Acrylic cube.Barium (Ba). 25 mm.
1 700,00 ₽
Keychain. Barium.
1 800,00 ₽
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.