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What Are The Physical Properties Of Boron?

Boron is a black solid which is a weak conductor at normal temperature and good at high temperatures. Traces of carbon compounds increase conductivity. When boron is oxidized in the air, it acts as a self-limiting effect due to the formation of the boron trioxide film. When the temperature is above 1000 ° C, the oxide layer evaporates. It reacts with fluorine at room temperature. It is not affected by aqueous hydrochloric acid and hydrofluoric acid solutions. It reacts violently with molten sodium peroxide, or a mixture of sodium carbonate and potassium nitrate. The boric powder is soluble in boiling nitric acid and sulfuric acid, as well as most molten metals such as copper, iron, manganese, aluminum and calcium. Boron is insoluble in water. The relative density is 2.350. The melting point of boron is about 2300 °C, and the boiling point is 3658 ° C.
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