Promethium

See also:

• Science: Chemistry: Elements: Lanthanides  (2)

• 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.