Uranium hexafluoride, often abbreviated as UF6, is a chemical compound composed of one uranium atom and six fluorine atoms. It is a key material in the nuclear fuel cycle, particularly in the process of enriching uranium for use in nuclear reactors and weapons. UF6 is unique because it can easily transition between solid and gas states, making it suitable for gas diffusion and gas centrifugation methods of enrichment. In its gaseous form, UF6 is used to separate isotopes of uranium, primarily U-235 and U-238. The compound is highly reactive and must be handled with care, as it can be toxic and corrosive. Proper safety measures are essential when working with UF6 to prevent exposure and environmental contamination.