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