Diagram of the nuclear composition, electron configuration, and valence (outer electron) orbitals of an atom of astatine-210 (atomic number: 85), an i
Diagram of the nuclear composition, electron configuration, and valence (outer electron) orbitals of an atom of astatine-210 (atomic number: 85), an isotope of this element. The nucleus consists of 85 protons (blue) and 125 neutrons (red). Astatine is a radioactive halogen in group 17, period 6, and the p-block of the periodic table. Astatine-210, the most stable of the isotopes of astatine, has a half-life of just over 8 hours.
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Photo credit: © CARLOS CLARIVAN/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No
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