Platinum Metals

WebElements: Promethium WebElements: Promethium- Extensive information on history, uses, occurrence, compounds, and properties. Wikipedia: Promethium Wikipedia: Promethium- Properties of the element, including its history, applications, and characteristics. Lenntech: Promethium Lenntech: Promethium- Physical data, chemical properties, health and environmental effects. EnvironmentalChemistry.com: Promethium EnvironmentalChemistry.com: Promethium- Atomic structure, chemical and physical properties, and table of nuclides. ChemicalElements.com: Promethium ChemicalElements.com: Promethium- Basic information, atomic structure, and isotopes. It's Elemental: Promethium It's Elemental: Promethium- Basic physical and historical information.