It's Elemental: Ruthenium
Basic physical and historical information.
Wikipedia: Ruthenium
Properties of the element, including its history, applications, and characteristics.
EnvironmentalChemistry.com: Ruthenium
Atomic structure, chemical and physical properties, and table of nuclides.
ChemGlobe: Ruthenium
Electronic, thermal, and steric data along with an isotope table.
LANL: Ruthenium
History, sources, uses, and properties.
ChemicalElements.com: Ruthenium
Basic information, atomic structure, and table of isotopes.
Visual Elements: Ruthenium
Image, discovery, uses, source, and physical information.
Lenntech: Ruthenium
Physical data, chemical properties, and health effects.
Ruthenium
Data tables and historic information.
WebElements: Ruthenium
Extensive information on history, uses, occurrence, compounds, and properties.
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