Ununpentium (Uup). Diagram of the nuclear composition, electron configuration, chemical data, and valence (outer electron) orbitals of an atom of unun
Ununpentium (Uup). Diagram of the nuclear composition, electron configuration, chemical data, and valence (outer electron) orbitals of an atom of ununpentium-288 (atomic number: 115), the most stable isotope of this radioactive element. The nucleus consists of 115 protons (red) and 173 neutrons (orange). 115 electrons (white) successively occupy available electron shells (rings). Ununpentium is a temporary name (2003 synthesis not yet official). It is a transactinide of unknown properties in group 15, period 7, and the p-block of the periodic table. The ununpentium-288 nucleus (half-life: 173 milliseconds) emits an alpha particle to form ununtrium-284.
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Photo credit: © CARLOS CLARIVAN/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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