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{{Element | name=Uranium | symbol=U | anumber=92 | amass=238.02891 amu | state=Solid | class=Metallic | cstructure=Orthorhombic| color=metallic grey, reacts slowly with oxygen and rapidly with water. | date=1789 | discname=Martin J. Klaproth | origname=From the planet Uranus. | uses=For many centuries it was used as a pigment for glass. Now it is used as a fuel in nuclear reactors and in nuclear weapons. Depleted Uranium is used in casings of armor piercing arterial artillery shells, armor plating on tanks and as ballast in the wings of some large aircraft. | obtained=Primary uranium bearing ores are uraninite, autunite, carnotite, samarskite and torbernite. }}
'''Uranium''' (U) is a heavy, naturally [[radioactive]], [[metal]]lic [[element]] with an [[atomic number]] of 92. Its two principally occurring [[isotope]]s are uranium-235 and uranium-238. Uranium-235 is indispensable to the nuclear industry because it is the only isotope existing in nature that is fissionable by thermal [[neutron]]s. Uranium-238 is also important because it absorbs neutrons to produce a [[radioactive]] isotope that subsequently decays to the isotope [[plutonium]]-239, which also is [[fission]]able by thermal neutrons.
