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dubnium

(do̵ob′nē əm)

noun

a radioactive chemical element with a very short half-life: a transactinide produced by bombarding californium or berkelium with high-energy nuclear particles: symbol, Db; at. no., 105

Origin: ModL, after Dubna, Russia, where important work in nuclear physics took place + -ium

See dubnium in American Heritage Dictionary 4

noun Symbol Db

An artificially produced radioactive element with atomic number 105 whose most long-lived isotopes have mass numbers of 258, 261, 262, and 263 with half-lives of 4.2, 1.8. 34, and 30 seconds, respectively. Also called unnilpentium. See Table at element.

Origin:

Origin: After Dubna, Russia, the location of the United Institute of Nuclear Research

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