The chemical symbol for uranium is U. Uranium is a heavy metal that has the atomic number 92 on the periodic table. It is well-known for its radioactive properties and is primarily used as fuel in nuclear reactors and in the production of nuclear weapons. Uranium occurs naturally in small amounts in rocks, soil, and even the oceans. Its isotope, uranium-235, is particularly important due to its ability to sustain a nuclear chain reaction. Uranium plays a significant role in discussions about energy and nuclear technology.