Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun An artificially produced radioactive element with atomic number 105. The isotope with mass number 262 has the longest confirmed half-life (35 seconds), although longer half-lifes have been reported for some of its heavier isotopes. cross-reference: Periodic Table.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A
transuranic chemical element (symbol Db) withatomic number 105. - noun chemistry, obsolete A rejected name for
rutherfordium .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a transuranic element
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
[After Dubna, Russia, location of the United Institute of Nuclear Research.]
from Wiktionary, Creative Commons Attribution/Share-Alike License
Named after Dubna in Russia.
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Examples
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Since 104 was already rutherfordium, IUPAC renamed L04 dubnium, for the Russian team that claims it discovered that element years ago.
All In A Name 2008
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Dubna has already been enshrined in the periodic table with dubnium element 105, so the Russians chose to honor Georgi N.
NYT > Home Page By KENNETH CHANG 2011
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The isotope with 177 neutrons decays down to dubnium (atomic number 105), whereas the isotope with 176 neutrons decays down to roentgenium (atomic number 111).
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oroboros commented on the word dubnium
Db.
December 16, 2007