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Ununtrium (Uut). Diagram of the nuclear composition and electron configuration of an atom of ununtrium-286 (atomic number: 113), the most stable isotope of this radioactive element. The nucleus consists of 113 protons (red) and 173 neutrons (blue). Ununtrium is a temporary name (2003 synthesis not yet official). It is a transactinide of unknown properties in group 13, period 7, and the p-block of the periodic table. The ununtrium-286 nucleus (half-life: 19.6 seconds) emits an alpha particle to form roentgenium-282.
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