Beryllium, the content of which is 0.001% in the earth’s crust, the main minerals are beryl, beryllium and chrysoberyl. Natural beryllium has three isotopes: beryllium-7, beryllium-8, and beryllium-10. Beryllium is a steel gray metal; melting point 1283°C, boiling point 2970°C, density 1.85...
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