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dubnium
[ doob-nee-uhm, duhb- ]
/ ˈdub ni əm, ˈdʌb- /
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noun Chemistry, Physics.
a superheavy, synthetic, radioactive element with a very short half-life. Symbol: Db; atomic number: 105.
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Do you know the difference between everyday US and UK terminology? Test yourself with this quiz on words that differ across the Atlantic.
Question 1 of 7
In the UK, COTTON CANDY is more commonly known as…
Formerly unnilpentium .
See also hahnium.
Origin of dubnium
First recorded in 1970–75; officially assigned to element 105 in 1997; 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, Du Bois, DuBois, W. E. B., Dubonnet, Dubos, Dubrovnik
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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
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
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