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Seaborgium (Sg). Diagram of the nuclear composition and electron configuration of an atom of seaborgium-269 (atomic number: 106), the most stable isotope of this radioactive element. The nucleus consists of 106 protons (red) and 163 neutrons (blue). Seaborgium, named after Glenn Seaborg and first synthesised in 1974, is a transactinide and transition metal in group 6, period 7, and the d-block of the periodic table. Seaborgium-269 has a half-life of 2.1 minutes, its nucleus emitting an alpha particle to form rutherfordium-265.
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