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EnvironmentalChemistry.com: Europium
Atomic structure, chemical and physical properties, and table of nuclides.
ChemicalElements.com: Europium
Basic information, atomic structure, and isotopes.
LANL: Europium
History, production, properties, sources, and uses.
Visual Elements: Europium
Image, source, physical information, and key isotopes.
Lenntech: Europium
Physical data, chemical properties, health and environmental effects.
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