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Element Details

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RHENIUM (75Re186.207)

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Element Description

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.

Property Name Property Value Property Name Property Value
Atomic Code (75Re186.207) Atomic Volume 8.85W/D
CAS # 7440-15-5 First Ionization Energy 182K-cal/g-mole
Electronegativity 1.9Pauling's
Melting Point 3180°C Covalent Radius 1.28Angstroms
Boiling Point 5900°C Linear Coefficient of Expansion 6.7x10-6K-1
Density 21.02g/cm3 Electrical Resistivity @ 20°C 19.3µΩ-cm
Themal Conductivity 0.17cal/cm2/cm/s/°C Crystal Structure Hexagonal
Specific Heat @ 25°C 0.033cal/g°C Vapor Pressure @ 2000°C 3x10-8mm
Heat of Fusion 7.9k-cal/g-atom Thermionic Work Function 4.8eV
Heat of Vaporization 152k-cal/g-atom Modulus of Elasticity 67x106psi

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