Astatine (At). Diagram of the nuclear composition and electron configuration of an atom of astatine-211 (atomic number: 85),a synthetic isotope of this element. The nucleus consists of 85 protons (red) and 126 neutrons (blue). 85 electrons (green) bind to the nucleus,successively occupying available electron shells (rings). Astatine is a radioactive halogen in group 17,period 6,and the p-block of the periodic table. Astatine-211,used in nuclear medicine,is produced by bombarding bismuth-209 with alpha particles. It has a half-life of less than 8 hours,its unstable nucleus undergoing electron capture or alpha particle decay | |
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Credit: | Science Photo Library |
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