Rhenium was discovered by the German chemists Ida Tacke-Noddack, Walter Noddack and Otto Carl Berg in 1925.
Name: Rhenium
Symbol: Re
Atomic number: 75
Atomic weight: 186.21
State: solid
Group, period, block: 7, 6, d
Color: silvery-white
Classification: transition metal
Electron configuration: 4f14 5d5 6s2
2,8,18,32,13,2
Physical properties
Density: 21.02 g/cm-3
Melting point: 3459 K, 3186 °C, 5767 °F
Boiling point: 5869 K, 5596 °C, 10105 °F
Atomic properties
Oxidation states: 7, 6, 5, 4, 3, 2, 1, 0, -1
Electronegativity: 1.9 (Pauling scale)
Ionization energies: 1st: 760 kJ·mol-1
Covalent radius: 122±3 pm
Van der Waals radius: no data
- Re
Electron Configuration
Isotopes
There are two naturally occurring isotopes of rhenium exist, 185Re, and 187Re.