dubnium

[doob-nee-uh m, duhb-]

noun Chemistry, Physics.

a superheavy, synthetic, radioactive element with a very short half-life. Symbol: Db; atomic number: 105.

Origin of dubnium

named after Dubna, the town in Russia where it was first produced; see -ium

Formerly hahnium, unnilpentium, element 105.

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British Dictionary definitions for dubnium

dubnium

noun

a synthetic transactinide element produced in minute quantities by bombarding plutonium with high-energy neon ions. Symbol: Du; atomic no 105See hahnium

Word Origin for dubnium

C20: after Dubna, where it was first reported

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

dubnium in Science

dubnium

[dōōb′nē-əm]

Db

A synthetic, radioactive element that is produced from californium, americium, or berkelium. Its 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. Atomic number 105. See Periodic Table.