In 1996 an international research team led by Peter Armbruster and Sigurd Hofmann at the Institute for Heavy Ion Research at Darmstadt, Germany bombarded lead-208 atoms with high-energy zinc-70 ions. In a two-week experiment, one of the resulting atoms was unambiguously identified as an isotope of element 112 with mass number 277 and a half-life of 280 msec. In 2009 the name copernicium, for Copernicus, was proposed for the element by its discoverers, and International Union of Pure and Applied Chemistry (IUPAC) approved the name in 2010. The most stable isotope, copernicium-285, has a half-life of approximately 29 sec.
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