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Rhenium (75Re186.207)
[7440-15-5]

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Elemental Form

Retaining its crystalline structure at temperatures up to its melting point, rhenium is gray to black in powder form, silvery-white and lustrous as a solid. It does not occur naturally. Rhenium has one of the highest densities, exceeded only by platinum, iridium, and osmium. Only tungsten has higher melting points. Rhenium has good wear resistance and it can withstand arc corrosion. Rhenium's range of valences exceed that of all other elements.
Melting Point3180°CBoiling Point5900°C
Density21.02g/cm3Themal Conductivity0.17cal/cm2/cm/s/°C
Specific Heat @ 25°C0.033cal/g°CHeat of Fusion7.9k-cal/g-atom
Heat of Vaporization152k-cal/g-atomAtomic Volume8.85W/D
First Ionization Energy182K-cal/g-moleElectronegativity1.9Pauling's
Covalent Radius1.28AngstromsLinear Coefficient of Expansion6.7x10-6K-1
Electrical Resistivity @ 20°C19.3µΩ-cmCrystal StructureHexagonal
Vapor Pressure @ 2000°C3x10-8mmThermionic Work Function4.8eV
Modulus of Elasticity67x106psi