- 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.
- 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.
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