Named Ununquadium, the latest addition to the periodic table is an artificial radioactive element that is the heaviest know. The nucleus decays to lead and the element is known to stay stable for approximately 2.6 seconds before decaying.
Element 114 on the brink of recognition - physics-math - 24 June 2010 - New Scientist
http://en.wikipedia.org/wiki/Ununquadium
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Latest results show the nucleus decays in less than a second.
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