It's Elemental: Europium - Basic physical and historical information.
ChemicalElements.com: Europium - Basic information, atomic structure, and isotopes.
EnvironmentalChemistry.com: Europium - Atomic structure, chemical and physical properties, and table of nuclides.
Wikipedia: Europium - Properties of the element, including its history, applications, and characteristics.
WebElements: Europium - Extensive information on history, uses, occurrence, compounds, and properties.
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