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