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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