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