It's Elemental: Uranium - Basic physical and historical information. ChemicalElements.com: Uranium - Basic information, atomic structure, and isotopes. EnvironmentalChemistry.com: Uranium - Atomic structure, chemical and physical properties, and table of nuclides. It's Elemental - Isotopes of the Element Uranium - Has an extensive list about the isotopes of uranium. Gives mass number, half life, branching percentage, and decay mode of the isotopes. Uranium: Properties: Element - Very extensive information about the chemical/physical properties of uranium. Information includes the occurrence of uranium, isotopes, and spectrum. Radioactive Byproducts of Depleted Uranium (Uranium-238) - Shows the byproducs of depleted uranium and shows their half-lives. Uranium-235 Chain Reaction - Shows examples uranium reactions in fission, as well as data about those reactions. Wikipedia: Uranium - Properties of the element, including its history, applications, and characteristics. Uranium and Its Compounds - Facts about uranium and its compounds, including physical and chemical properties, uses, and possible health effects. The Element Uranium - Basic and advanced technical details and history concerning uranium. Depleted Uranium - Information about depleted uranium in question and answer form. WebElements: Uranium - Extensive information on history, uses, occurrence, compounds, and properties.