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Boron (5B10.811)
[7440-42-8]

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Elemental Form

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.
Melting Point2075°CBoiling Point2550°C
Density2.34g/cm3Specific Heat @ 25°C0.309cal/g°C
Heat of Fusion5.3k-cal/g-atomHeat of Vaporization128k-cal/g-atom
Atomic Volume4.6W/DFirst Ionization Energy191K-cal/g-mole
Electronegativity2.0Pauling'sCovalent Radius0.82Angstroms
Mohs Hardness @ 20°C9.3Electrical Resistivity @ 20°C4x106µΩ-cm
Crystal StructureRhombohedral