Question

history of element dubnium?

Answer 1

"Scientist working at the join institute for nuclear research in Dunbna, Russia, first reported the production of dubnium in 1967 "
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Answer 2

Scientists working at the Joint Institute for Nuclear Research in Dubna, Russia, first reported the production of dubnium in 1967. They bombarded atoms of americium-243 with ions of neon-22, forming atoms of dubnium-260 and five free neutrons and atoms of dubnium-261 and four free neutrons. In 1970, a group of scientists working at the Lawrence Radiation Laboratory, now known as the Lawrence Berkeley Laboratory, in Berkeley, California, bombarded atoms of californium-249 with ions of nitrogen-15, forming atoms of dubnium-260 and 4 free neutrons. Credit for the discovery of dubnium is still under debate.

Dubnium's most stable isotope, dubnium-268, has a half-life of about 32 hours and decays through spontaneous fission.

Due to the small amounts produced and its short half-life, there are currently no uses for dubnium outside of basic scientific research.