unnilquadium | engleski leksikon

1. unnilquadium


Synthesized, radioactive, metallic element, the first of the transactinide series, symbol Unq, atomic number 104, atomic weight 262. It is produced by bombarding californium with carbon nuclei and has ten isotopes, the longest-lived of which, Unq-262, has a half-life of 70 seconds.
Two institutions claim to be the first to have synthesized it: the Joint Institute for Nuclear Research in Dubna, Russia, in 1964 (proposed name kurchatovium); and the University of California at Berkeley, US, in 1969 (proposed name rutherfordium).

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