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Flerovium (Fl). Diagram of the nuclear composition and electron configuration of an atom of flerovium-289 (atomic number: 114), the most stable isotope of this radioactive element. The nucleus consists of 114 protons (red) and 175 neutrons (blue). Flerovium, named after Georgy Flyorov and first synthesised in 1999, is a transactinide of unknown properties in group 14, period 7, and the p-block of the periodic table. There are two nuclear isomers of flerovium-289, with half-lives of 2.6 seconds and 1.1 minutes.
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