Symbol Fl. A radioactive transactinide element; a.n. 114. It was first made in 1998 at Dubna, Russia, by bombarding plutonium–244 nuclei with calcium–20 nuclei and also occurs from the decay of even heavier elements. About 80 atoms of flerovium have been made. It is thought that the isotope flerovium–298 should be relatively long-lived since both the number of protons (114) and that of neutrons (184) are magic numbers. Flerovium is named after the Russian nuclear physicist Georgy Flerov (1913–90).