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.

Nearby words

dublin, dublin bay prawn, dubliner, dubliners, dubna, dubnium, dubois, dubois abscesses, dubois, w. e. b., dubonnet, dubos

Origin of dubnium

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

Formerly hahnium, unnilpentium, element 105.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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

Science 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.