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Elemental boron, black or dark brown in color, is not found in nature in its pure form, but occurs as orthoboric acid or as borates. Boron's energy band gap of 1.50 to 1.56eV exceeds that of either silicon or germanium. It transmits portions of the infrared. While a good conductor of electricity at high temperatures, boron's conductivity drops significantly at room temperature.
|Property Name||Property Value||Property Name||Property Value|
|Atomic Code||(5B10.811)||Heat of Vaporization||128k-cal/g-atom|
|CAS #||7440-42-8||Atomic Volume||4.6W/D|
|First Ionization Energy||191K-cal/g-mole|
|Boiling Point||2550°C||Covalent Radius||0.82Angstroms|
|Density||2.34g/cm3||Mohs Hardness @ 20°C||9.3|
|Specific Heat @ 25°C||0.309cal/g°C||Electrical Resistivity @ 20°C||4x106µΩ-cm|
|Heat of Fusion||5.3k-cal/g-atom||Crystal Structure||Rhombohedral|