Polonium (Po). Diagram of the nuclear composition and electron configuration of an atom of polonium-210 (atomic number: 84),a natural isotope of this element. The nucleus consists of 84 protons (red) and 126 neutrons (blue). 84 electrons (green) bind to the nucleus,successively occupying available electron shells (rings). Polonium is a radioactive metalloid in group 16,period 6,and the p-block of the periodic table. Discovered in 1898 by the Curies,it was named after Poland. Polonium-210,which forms in uranium ores,has a half-life of 138 days,emitting an alpha particle from its unstable nucleus to form lead-206 | |
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