Uranium (chemical symbol U) is a naturally occurring radioactive element. In its pure form it is a silver-coloured heavy metal, similar to lead, cadmium and tungsten. Like tungsten it is very dense, ...

Whereas scientists could only use natural uranium in a uranium machine, Heisenberg noted that they could use pure uranium 235 ... No one knows the exact form of the device tested.

Nuclear reactors that use heavy water can employ a form of uranium commonly found in nature ... to find a definitive value for the density of pure water, but despite meticulous experiments ...

Low Enriched Uranium (LEU) is the basic material to fabricate nuclear fuel. It consists of uranium hexafluoride that is a white-grey, waxy solid at standard temperature and pressure. LEU is made by ...