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Ununoctium (Uuo). Diagram of the nuclear composition and electron configuration of an atom of ununoctium-294 (atomic number: 118), the only known isotope of this radioactive element. The nucleus consists of 118 protons (red) and 176 neutrons (blue). Ununoctium is a temporary name (2002 synthesis not yet official). It is a transactinide of unknown properties in group 18, period 7, and the p-block of the periodic table. The ununoctium-294 nucleus (half-life: 0.89 milliseconds) emits an alpha particle to form ununhexium-290.
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