Rhenium

Atomic number

75

Atomic mass (u)

186.207

Category

Transition metal

Standard state

Solid

Melting point

3185.85 °C (3459 K)

Boiling point

5595.85 °C (5869 K)

Density (g/cm³)

20.8

Electronegativity (Pauling)

1.9

Electron configuration

[Xe]6s2 4f14 5d5

Oxidation states

+7, +6, +4

Atomic radius (pm)

217

First ionization energy (eV)

7.88

Discovery & recognition

Discovery year / period (PubChem)

1925

Discovery credited to (RSC)

Walter Noddack, Ida Tacke and Otto Berg

Date or period recorded by RSC

1925

Discovery place

Berlin, Germany (isolation)

An ancient date does not identify a first human discovery. Different references may date observation, isolation and formal recognition differently.

Natural occurrence & production

The creation of an element’s nuclei and its concentration into terrestrial deposits are different processes. The occurrence note below concerns its presence or production on Earth; it is not a complete account of nucleosynthesis.

“Rhenium is among the rarest metals on Earth.”

Royal Society of Chemistry · occurrence excerpt ↗

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Reference values are not product specifications. Blank values have not been estimated. For superheavy elements, some properties and family assignments are theoretical or incompletely measured.