- Visual Elements: Europium - http://www.chemsoc.org/viselements/pages/europium.html
- Image, source, physical information, and key isotopes.
- It's Elemental: Europium - http://education.jlab.org/itselemental/ele063.html
- Basic physical and historical information.
- ChemicalElements.com: Europium - http://www.chemicalelements.com/elements/eu.html
- Basic information, atomic structure, and isotopes.
- EnvironmentalChemistry.com: Europium - http://environmentalchemistry.com/yogi/periodic/eu.html
- Atomic structure, chemical and physical properties, and table of nuclides.
- Lenntech: Europium - http://www.lenntech.com/periodic-chart-elements/eu-en.htm
- Physical data, chemical properties, health and environmental effects.
- Wikipedia: Europium - http://en.wikipedia.org/wiki/europium
- Properties of the element, including its history, applications, and characteristics.
- LANL: Europium - http://periodic.lanl.gov/elements/63.html
- History, production, properties, sources, and uses.
- ChemGlobe: Europium - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/63.html
- Electronic, thermal, and steric data along with isotopes table.
- WebElements: Europium - http://www.webelements.com/webelements/elements/text/eu/key.html
- Extensive information on history, uses, occurrence, compounds, and properties.
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