Rhenium

ElementRheniumSymbolRe
Atomic Number75Molar Mass186.2 gmol-1
Electron Configuration[Xe]4f145d56s2Normal Statesolid metal
Density @STP21.02 g cm-3Melting Point3186oC
Boiling Point5596oCStable Isotopes185Re, 187Re
Atomic Radius137 pmIonic Radius72 (4+) pm
Electronegativity (Pauling)1.9Ionization Energy (1st)760 kJ mol-1
Ionization Energy (2nd)1260 kJ mol-1Ionization Energy (3rd)2510 kJ mol-1
Molar Heat Capacity25.5 J K-1mol-1Standard Molar Entropy36.9 J K-1mol-1
Enthalpy of Fusion33.1 kJ mol-1Enthalpy of Vapourization707.1 kJ mol-1
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