ElementRuthenium
SymbolRu
Atomic Mass101.07
Atomic Number44
Name OriginsLatin, Ruthenia = Russia
Year Discovered1808
Discovered CreditsDiscovered by J. A. Sinadecki at University of Vilno, Poland. Rediscovered in 1828 by G. W. Osann at University of Tartu, Russia.
RemarksLustrous, 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 TestsThere 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.
ReferencesEmsley, J., 1991; THE ELEMENTS : Sec. Ed., Clarendon Press, Oxford, 251 p.

Naturally Ocurring Isotopes :

Mass Nuclide Number Natural Abundance Half-life Half-life Unit Decay Mode Decay Mode MeV Decay Mode %
95.907599 96 5.53 % Stable
97.905287 98 1.87 % Stable
98.905939 99 12.7 % Stable
99.904219 100 12.6 % Stable
100.905582 101 17.1 % Stable
101.904348 102 31.6 % Stable
103.905424 104 18.6 % Stable

13 Minerals sorted by % of Ru (Ruthenium) :

Laurite61.18 %RuS2
Ruarsite48.58 %RuAsS
Ruthenarsenite45.83 %(Ru,Ni)As
Ruthenium44.16 %(Ru,Ir,Os)
Anduoite27.75 %(Ru,Os)As2
Irarsite11.92 %(Ir,Ru,Rh,Pt)AsS
Hexaferrum9.35 %(Fe,Os,Ru,Ir)
Osarsite9.19 %(Os,Ru)AsS
Omeiite7.95 %(Os,Ru)As2
Iridarsenite7.91 %(Ir,Ru)As2
Rutheniridosmine5.54 %(Ir,Os,Ru)
Iridium5.53 %(Ir,Os,Ru,Pt)
Platarsite3.81 %(Pt,Rh,Ru)AsS