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Dubnium (Db). Diagram of the nuclear composition and electron configuration of an atom of dubnium-268 (atomic number: 105), the most stable isotope of this radioactive element. The nucleus consists of 105 protons (red) and 163 neutrons (blue). Dubnium, named for where it was first synthesised in 1970, is a transactinide and transition metal in group 5, period 7, and the d-block of the periodic table. Dubnium-268 has a half-life of 29 hours, its nucleus stabilising by electron capture to form rutherfordium-268.
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