Uranium (U) is a chemical element with atomic number (Z) 92, group n/a, period 7, and atomic weight 238.028. The Uranium (U) is a hard, dense, ductile, silver-white, radioactive metal with half-lives varying between 159,200 years and 4.5 billion years that has very high density. Uranium gained importance with the development of practical uses of nuclear energy. (Refer to the Chemical Element; Periodic Table)

Related Definitions in the Project: The Element and Substance