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An artificial transplutonium element; atomic number 106; atomic weight 263. [Formerly called Unnilhexium, Unh 263.]
[Glenn T. Seaborg, U.S. chemist and Nobel laureate, 1912-1999]
Etymology: Glenn T. Seaborg, American chemist and educator, 1912-1999
a synthetic radioactive element, with a half-life of 0.9 second. Its atomic number is 106; its atomic mass is 266. It was first synthesized in 1974 by scientists working independently in the United States and Russia.