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nature : Periodic System III main group (group B) elements. Atomic number five. Stable isotopes 10,11. Amu 10.811. The amorphous boron black or dark brown powder. Crystalline boron black or gray with shiny crystals, second only to the hardness of diamond, the more brittle. The amorphous boron in the slow oxidation in air, high temperature combustion, boron oxide formation. Density : 2.34 crystal, amorphous - 2.37. 2100 ° C melting point. Boiling Point 2550 ° C Valence +3. Do not dissolve in water, ethanol and ether. Soluble in concentrated nitric acid and sulfuric acid. Temperatures easily with oxygen, nitrogen, except for metallurgical gas agent, adding boron alloy can raise the temperature hardness and conductivity. Boron compounds widely used in medicine, glass, chemical, leather industry, boron alloy with plastic or combination of effective neutron shielding material, boron steel can be used as the atomic reactor control rod. Boride for more rigidity, high temperatures and chemical inert material, industry wide range of uses, such as the production of high hardness cutting tool materials and senior grinding material (silicon carbide). Borane because of its heat, burn fast, aerospace industry for the high-energy fuel. Nature was the main borate and boric acid form. May boron oxide or aluminum and magnesium powder and heating reduction obtained.
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