The chemical symbol for Rhenium is Re and its atomic number is 75.
We find it listed in the periodic table of elements in group 7 and 6 period and block.
Rhenium belongs to the family of transition metals such as for example the Silver, the Bohrium, cadmium, ...
This element is stable.
Rhenium was named after the german river Rhenus.
Atomic number (Z) 75
Group, block group 7, d-block
Period: period 6
Element category: transition metal
Standard atomic weight (±) (Ar) 186.207(1)
Electron configuration: [Xe] 4f14 5d5 6s2
per shell: 2, 8, 18, 32, 13, 2
Physical properties
Phase: solid
Melting point: 3459 K (3186 °C, 5767 °F)
Boiling point: 5869 K (5596 °C, 10,105 °F)
Density near r.t.: 21.02 g/cm3
when liquid, at m.p. 18.9 g/cm3
Heat of fusion: 60.43 kJ/mol
Heat of vaporization: 704 kJ/mol
Molar heat capacity: 25.48 J/(mol·K)
Atomic properties
Oxidation states: 7, 6, 5, 4, 3, 2, 1, 0, −1, −3 (a mildly acidic oxide)
Electronegativity: Pauling scale: 1.9
Ionization energies 1st: 760 kJ/mol
2nd: 1260 kJ/mol
3rd: 2510 kJ/mol
Atomic radius empirical: 137 pm
Covalent radius: 151±7 pm
Crystal structure: hexagonal close-packed
Speed of sound thin rod: 4700 m/s (at 20 °C)
Thermal expansion: 6.2 µm/(m·K)
Thermal conductivity: 48.0 W/(m·K)
Electrical resistivity: 193 nΩ·m (at 20 °C)
Magnetic ordering paramagnetic
Young's modulus: 463 GPa
Shear modulus : 178 GPa
Bulk modulus: 370 GPa
Poisson ratio: 0.30
Mohs hardness: 7.0
Vickers hardness: 1350–7850 MPa
Brinell hardness: 1320–2500 MPa
CAS Number: 7440-15-5