NO. 075Transition

Re

Rhenium

Rhenium is one of the densest elements and is used in jet engine superalloys.

Crystal Structure

Hexagonal close-packed (hcp)

Atomic Mass186.21 u

Density21.02 g/cm³

Melting Point3459 K

Boiling Point5869 K

Atomic Radius137 pm

Electronegativity1.9

Ionization Energy760 kJ/mol

Electron Affinity15 kJ/mol

Bonding TypeMetallic

Oxidation States-1, 2, 4, 6, 7

Acid/BaseBasic

ReactivityLow

Electron Configuration

[Xe] 4f14 5d5 6s2

Discovered ByWalter Noddack

Year1925

Known Isotopes

Re-185Re-187