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Amorphous boron also called element boron, monomer boron. It is ensemble color powder or gray luster crystal, chemical properties quite lively. In the air and stable under normal temperature. Heat to 300 ℃ by oxidation, 700 ℃ is on fire. When burning flame red, trace gasification of boron flame show green. Insoluble in water, hydrochloric acid, ethanol, ethyl ether. Soluble in cold strong alkali solution and the separating hydrogen, be concentrated nitric acid and concentrated sulfuric acid oxidation into boric acid. High temperature can boron in oxygen, nitrogen, sulfur, halogen and carbon interaction, boron can also with many metal direct combination, and generate boride. Boron and organic compound reaction can be directly generated boron and carbon connected combined and things or boron and carbon compound between aerobic existence.
Monomer boron in the periodic table of the elements is divided into metal and nonmetal demarcation line color special position, right and wrong metallicity dominant element, electronegative is very strong, atomic radius small, nuclear charge concentration, non-metallic properties and silicon similar. Its density 2.35 g/cm3. Hardness 9.3, specific gravity is 2.33-2.45, melting point: 2300 ℃, boiling point: 2550 ℃.
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