Periodic Table of Elements

75

Rhenium

186.21

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 kJmol-1
Covalent radius: 1223 pm
Van der Waals radius: no data
  • Re
  • Electron Configuration

Isotopes

There are two naturally occurring isotopes of rhenium exist, 185Re, and 187Re.