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Bohrium (Bh). Diagram of the nuclear composition and electron configuration of an atom of bohrium-270 (atomic number: 107), the most stable isotope of this radioactive element. The nucleus consists of 107 protons (red) and 163 neutrons (blue). Bohrium, named after Niels Bohr and first synthesised in 1981, is a transactinide and transition metal in group 7, period 7, and the d-block of the periodic table. Bohrium-270 has a half-life of 61 seconds, its nucleus emitting an alpha particle to form dubnium-266.
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