Name ruthenium
Symbol Ru
Atomic Weight 101.07
Atomic Number 44
CAS ID 7440-18-8
Group Number 8
Group Name Precious Metal
Period Number 5
Origin of Name Latin, Ruthenia = "Russia."
Year Discovered 1808
Discovery Credits Discovered by J. A. Sinadecki at University of Vilno, Poland. Rediscovered in 1828 by G. W. Osann at University of Tartu, Russia.
Class Metallic
Color Silvery White
Standard State Solid at 77 F & 298 K
Description Lustrous, silvery metal of the platinum group. Unaffected by air, water and acids but dissolves in molten alkali. Used to harden Pt and Pd, and as a catalyst.

Diagnostic tests: 
There are no simple chemical tests for ruthenium. 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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