dubnium

[ doob-nee-uh m, duhb- ]
/ ˈdub ni əm, ˈdʌb- /

noun Chemistry, Physics.

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

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Formerly hahnium, unnilpentium, element 105.

Origin of dubnium

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

Words nearby dubnium

dublin, dublin bay prawn, dubliner, dubliners, dubna, dubnium, dubois, dubois abscesses, dubois, w. e. b., dubonnet, dubos
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for dubnium

dubnium
/ (ˈdʌbnɪəm) /

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

Scientific definitions for dubnium

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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.