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BORON (5B10.811)

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Element Description

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
Melting Point 2075°C Electronegativity 2.0Pauling's
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

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