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See also:
- 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.
