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75Re186.207
Rhenium
Transition MetalRhenium is a chemical element with symbol Re and atomic number 75. It is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. With an estimated average concentration of 1 part per billion (ppb), rhenium is one of the rarest elements in the Earth's crust.
Phase: SolidAppearance: silvery-grayish
2, 8, 18, 32, 13, 2
Physical Properties
Atomic Mass186.2071 u
Density21.02 g/cm³
Melting Point3459 K
Boiling Point5869 K
Molar Heat25.48 J/(mol·K)
Period6
PhaseSolid
Chemical Properties
Electron Configuration1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d5
Semantic Config[Xe] 4f14 5d5 6s2
Shells2, 8, 18, 32, 13, 2
Electron Affinity5.8273 kJ/mol
Electronegativity1.9
Ionization Energies
IE1: 760 kJ/molIE2: 1260 kJ/molIE3: 2510 kJ/molIE4: 3640 kJ/mol
Discovery