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BERYLLIUM

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4

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Be

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9.013


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2-2

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1.85

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1278° C

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1970° C

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+2

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HCP

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lightweight, corrosion-resistant, steel-gray-metal

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Beryllium copper springs, electrical contacts, x-ray tube windows, non-sparking safety tools, structures in computers, aircraft

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Beryllium has hight fatigue resistance and is very light. The crystalline variety is very hard and is transparent to some infrared sections.  It is easily penetrated by X-rays.  Discovered in 1798 by Vauquelin.