See also:

• Science: Chemistry: Elements: Transition Metals  (3)

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