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The sixth transuranium element to be synthesized, californium is an artificially produced, radioactive metallic chemical element. A member of the actinide series of elements, it has isotopes with half-lives ranging from about 40 seconds to 900 years. One isotope, californium-252, is used as a neutron source in nuclear reactors. More than 50 years after it was first produced by researchers at the University of California at Berkeley, californium was used to create what superheavy element? Discuss
Source: The Free Dictionary