Uranium hexafluoride

To produce enriched uranium for nuclear bombs, uranium hexafluoride, which can be easily evaporated, was separated through the gaseous diffusion of uranium hexafluoride. This allowed the isolation of uranium-235 from uranium-238, facilitating the creation of enriched uranium.
 Philip Hauge Abelson United States 1940 Uranium hexafluoride

To produce enriched uranium for nuclear bombs, uranium hexafluoride, which can be easily evaporated, was separated through the gaseous diffusion of uranium hexafluoride. This allowed the isolation of uranium-235 from uranium-238, facilitating the creation of enriched uranium.