Diagram of the nuclear composition, electron configuration, and valence (outer electron) orbitals of an atom of neptunium-237 (atomic number: 93), an
Diagram of the nuclear composition, electron configuration, and valence (outer electron) orbitals of an atom of neptunium-237 (atomic number: 93), an isotope of this element. The nucleus consists of 93 protons (blue) and 144 neutrons (red). Neptunium is an actinide and transuranic element in period 7, and the f-block of the periodic table. Actinides are soft radioactive metals. Neptunium-237, produced in the nuclear fuel cycle, is the most stable isotope of neptunium, with a half-life of million years.
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Photo credit: © CARLOS CLARIVAN/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
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