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