Relative atomic mass: 186.207 +- 0.001

English: Rhenium
French: Rhenium
Croatian: Renij
German: Rhenium
Italian: Renio
Spanish: Renio

Atomic number: 75
Group numbers: 7
Period: 6
Standard state (20 oC): solid

Discovery: 1925 Walter Noddack, Ida Tacke-Noddack, Otto Berg (DE)
Rhenium was discovered by Walter Noddack, Ida Tacke-Noddack and Otto Berg (DE) in 1925. The origin of the name comes from the Latin word Rhenus meaning river Rhine. It is a rare and costly, dense, silvery-white metal that tarnishes in moist air, resists corrosion and oxidation .Rhenium dissolves in nitric and sulfuric acids but has a very high melting point. Rhenium is found in small amounts in gadolinite and molybdenite. It is mixed with tungsten or platinum to make filaments for mass spectrographs. Its main value is as a trace alloying agent for hardening metal components that are subjected to continuous frictional forces. The price of 99.99 % pure rhenium slug is 503.00 for 50 g.
Electronic configuration: [Xe] 4f14 5d5 6s2
Formal oxidation number: +4 +6 +7
Atomic radius: 137.1 pm

Electronegativities: 1.9
Thermal conductivity: 47.9 W/(m K)
Electrical resistivity (20 oC): 19.3 microOhm cm

Melting point: 3186 oC
Boiling point: 5596 oC

Heat of fusion: 33.1 kJ/mol
Heat of vaporization: 704.25 kJ/mol
Heat of atomization: 769 kJ/mol

74W <= 75Re => 76Os

ASCII Periodic Table of the Elements
29 Aug. 2017
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