rhenium

Name rhenium
Symbol Re
Atomic Weight 186.207
Atomic Number 75
CAS ID 7440-15-5
Group Number 7
Group Name (none)
Period Number 6
Origin of Name After the Rhine river.
Year Discovered 1925
Discovery Credits W. Noddack, Ida Tacke, and O. Berg in Berlin, Germany.
Class Metallic
Color Grayish White
Standard State Solid at 77 F & 298 K
Description Silvery metal, usually obtained as gray powder. Resists corrosion and oxidation but slowly tarnishes in moist air. Dissolves in nitric and sulfuric acids. Used in filaments, thermistors, and catalysts.

Diagnostic tests: 
There are no simple chemical tests for rhenium. The element is usually found as an alloy or a sulfide mineral with other platinum group metals. Atomic Absorption Spectroscopy is used for quantitative analysis and Energy Dispersive Analysis of X-rays (EDAX) is used for qualitative analysis.

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