- Visual Elements: Ruthenium - http://www.chemsoc.org/viselements/pages/ruthenium.html
- Image, discovery, uses, source, and physical information.
- ChemicalElements.com: Ruthenium - http://www.chemicalelements.com/elements/ru.html
- Basic information, atomic structure, and table of isotopes.
- It's Elemental: Ruthenium - http://education.jlab.org/itselemental/ele044.html
- Basic physical and historical information.
- EnvironmentalChemistry.com: Ruthenium - http://environmentalchemistry.com/yogi/periodic/ru.html
- Atomic structure, chemical and physical properties, and table of nuclides.
- Lenntech: Ruthenium - http://www.lenntech.com/periodic-chart-elements/ru-en.htm
- Physical data, chemical properties, and health effects.
- Wikipedia: Ruthenium - http://en.wikipedia.org/wiki/ruthenium
- Properties of the element, including its history, applications, and characteristics.
- LANL: Ruthenium - http://periodic.lanl.gov/elements/44.html
- History, sources, uses, and properties.
- ChemGlobe: Ruthenium - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/44.html
- Electronic, thermal, and steric data along with an isotope table.
- WebElements: Ruthenium - http://www.webelements.com/webelements/elements/text/ru/key.html
- Extensive information on history, uses, occurrence, compounds, and properties.
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