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Rhenium

Metalsolid
Symbol: Re
Atomic number: 75
Atomic mass: 186.207
Group: Transition Metal
CAS-number: 7440-15-5

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Physical data
Isotopes
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Physical data

Electronic dataThermal dataSteric data
Shells: 2, 8, 18, 32, 13, 2
Orbitals: [Xe] 4f14 5d5 6s2
Electronegativity: 1.9, 1.5
1. Ionization potential: 7.88 eV
2. Ionization potential: -- eV
3. Ionization potential: -- eV
Oxidation states: 7, 6, 4, 2, -1
Electrical conductivity: 0.0542 10^6
Melting point: 3180 °C
Boiling point: 5627 °C (estimated)
Specific heat: 0.13 J/gK
Heat of fusion: 33.20 kJ/mol
Heat of vaporization: 715.0 kJ/mol
Thermal conductivity: 0.479 W/cmK
Atomic radius: 1.97 Å
Ionic radius: 0.53 Å (+7)
Covalent radius: 1.28 Å
Atomic volume: 8.85 cm³/mol
Density (293 K): 21.0 g/cm³
Crystal structure: hexagonal
hexagonal

Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
182Re 0 182 7 2.67d EC View
182Rem 0 182 2 12.7h EC, β+ View
183Re 0 183 5/2 70d EC View
184Re 0 184 3 38d EC View
184Rem 0 184 8 165d IT, EC View
185Re 37.07 184.953 5/2 -- --
186Re 0 186 1 3.777d β-, EC View
187Re 62.93 186.956 5/2 4.1E10y β- View
188Re 0 188 1 16.94h β- View

Other info

Name origin:Latin: Rhenus, the Rhine River.
Description:Rare and costly, dense, silvery-white metal.
Discovered by:Walter Noddack, Ida Tacke, Otto Berg
Year:1925
Place:Germany
Sources:Found in small amounts in gadolinite and molybdenite. Has a very high melting point.
Use(s):Mixed with tungsten or platinum to make filaments for mass spectrographs. Its main value is as a trace alloying agent for hardening metal components that are subjected to continuous frictional forces.