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Boron

Density 2.34 g/cm3
Thermal Conductivity @ 20oC 0.020 cal/(s/cm/oC)
Specific Heat @ 25oC 0.309 cal/g
Heat of Fusion 5.3 kcal/g-atom
Heat of Vaporization 128 cal/g
Atomic Volume 4.6 W/D
First Ionizaton Energy 191 kcal/g-atom
Electronegativity 2.0 Paulings
Covalent Radius 0.82 Angstroms
Mohs Hardness @ 20oC 9.3
Linear CTE @ 25oC  
Electrical Resistivity @ 20oC 4.0 Mohm/cm
Electrical Conductance  
Crystal Structure Hexagonal
Modulus of Elasticity  
Thermal Neutron Cross-section  
Magnetic Succeptibility @ 18oC  
Tensile Strength  
Electron Work Function  
Vapor Pressure @ 1200oC  
Poisson Ratio  
Shear Modulus