Ununseptium

Ununseptium is the temporary name of a superheavy artificial chemical element with temporary symbol Uus and atomic number 117. The element, also known as eka-astatine or simply element 117, is the second-heaviest of all the elements that have been reportedly created so far and is the second-to-last element of the 7th period of the periodic table. Its discovery was first announced in 2010—synthesis was claimed in Dubna, Russia, by a joint Russian–American collaboration, thus making it the most recently discovered element. Another experiment in 2011 created one of its daughter isotopes using a different method, partially confirming the results of the discovery experiment, and the original experiment was repeated successfully in 2012. The IUPAC/IUPAP Joint Working Party (JWP), however, has made no comment yet on whether or not the element can be recognized as discovered.