It's Elemental: Europium
Basic physical and historical information.
Wikipedia: Europium
Properties of the element, including its history, applications, and characteristics.
EnvironmentalChemistry.com: Europium
Atomic structure, chemical and physical properties, and table of nuclides.
ChemGlobe: Europium
Electronic, thermal, and steric data along with isotopes table.
LANL: Europium
History, production, properties, sources, and uses.
ChemicalElements.com: Europium
Basic information, atomic structure, and isotopes.
Visual Elements: Europium
Image, source, physical information, and key isotopes.
Lenntech: Europium
Physical data, chemical properties, health and environmental effects.
Europium
Data tables and historic information.
WebElements: Europium
Extensive information on history, uses, occurrence, compounds, and properties.
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