Astatine, atomic structure

Astatine, atomic structure

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This image is part of the sequence science and technology: atomic structure and data for the elements


Caption: Astatine (At). Diagram of the nuclear composition, electron configuration, chemical data, 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 (red) and 125 neutrons (orange). 85 electrons (white) successively occupy available electron shells (rings). 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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