ChemicalElements.com: Samarium
Basic information, atomic structure, and isotopes table.
EnvironmentalChemistry.com: Samarium
Atomic structure, chemical and physical properties, and table of nuclides.
It's Elemental: Samarium
Basic physical and historical information.
Lenntech: Samarium
Physical data, chemical properties, health and environmental effects.
Visual Elements: Samarium
Image, source, uses, physical information, and key isotopes.
WebElements: Samarium
Extensive information on history, uses, occurrence, compounds, and properties.
Wikipedia: Samarium
Properties of the element, including its history, applications, and characteristics.