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( Ununoctium)
Ununoctium (pronounced /?ju?n?'n?kti?m/[9] or /??n?'n?kti?m/), also known as eka-radon or element 118, is the temporary IUPAC name[10] for the transactinide element having the atomic number 118 and temporary element symbol Uuo. On the periodic table of the elements, it is a p-block element and the last one of the 7th period. Ununoctium is currently the only synthetic member of group 18 and has the highest atomic number and highest atomic mass assigned to a discovered element. The radioactive ununoctium atom is very unstable, and since 2002, only three atoms of the isotope 294Uuo have been detected.[11] While this allowed for very little experimental characterization of its properties and its compounds, theoretical calculations have allowed for many predictions, including some very unexpected ones. For example, although ununoctium is a member of the noble gas group, it could have a higher chemical reactivity than some elements outside this group.[2] Furthermore, it is predicted that it might not even be a gas under normal conditions.[2][12] In late 1998, the Polish physicist Robert Smolanczuk published some calculations on the fusion of atomic nuclei towards the synthesis of superheavy atoms, including the element 118.[13] His calculations suggested that it might be possible to make element 118 by fusing lead with krypton under carefully controlled conditions.[13] In 1999, researchers at Lawrence Berkeley National Laboratory made use of these predictions and announced the discovery of elements 116 and 118, in a paper published in Physical Review Letters,[14] and very soon after the results were reported in Science.[15] The researchers claimed to have performed the reaction
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