Uranium
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Uranium (U) is a heavy, naturally radioactive, metallic element with an atomic number of 92. Its two principally occurring isotopes 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 neutrons. 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 fissionable by thermal neutrons.
"Depleted" Uranium is one of the densest materials known to man; As such, the United States of America uses it for bullets and tank armor. There are no known health risks stemming from exposure to it.