Rhenium - ASCII Periodic Table of the Elements

ASCII PERIODIC TABLE OF THE ELEMENTS

  Re

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.

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