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Uranium (U). Diagram of the nuclear composition, electron configuration, chemical data, and valence (outer electron) orbitals of an atom of uranium-23
Uranium (U). Diagram of the nuclear composition, electron configuration, chemical data, and valence (outer electron) orbitals of an atom of uranium-238 (atomic number: 92), the most stable isotope of this element. The nucleus consists of 92 protons (red) and 146 neutrons (orange). 92 electrons (white) successively occupy available electron shells (rings). Uranium is an actinide in period 7, and the f-block of the periodic table. Actinides are soft radioactive metals. Uranium-238, used as a nuclear fuel, contributes to the Earth's internal heat. It has a half-life of billion years. Its nucleus decays by spontaneous fission or emitting an alpha particle to form thorium-234.
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Photo credit: © CARLOS CLARIVAN/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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