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ChemicalElements.com: Samarium
Basic information, atomic structure, and isotopes table.
Wikipedia: Samarium
Basic historical information.
ChemGlobe: Samarium
Electronic, thermal, and steric data along with an isotope table.
Lenntech: Samarium
Physical data, chemical properties, health and environmental effects.
It's Elemental: Samarium
Basic physical and historical information.
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