Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun An artificially produced radioactive element with atomic number 111 that has only been produced in trace amounts. Its most stable known isotope has a mass number of 280 and a half-life of 3.6 seconds. cross-reference: Periodic Table.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A
transuranic chemical element (symbol Rg) with atomic number 111.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a radioactive transuranic element
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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Elements 110, 111 and 112 have been named darmstadtium (Ds), roentgenium (Rg) and copernicium (Cn).
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Roentgenium, after a modern physicist renamed roentgenium by the General Assembly, was originally discovered in 1994 when a team at GSI created three atoms of the element, about a month after their discovery of darmstadtium, on Dec. 8.
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The previous heavyweight winners were copernicium (285) and roentgenium (272).
Wired Top Stories Mark Brown 2011
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Elements 110, 111 and 112 have been named darmstadtium (Ds), roentgenium (Rg) and copernicium (Cn).
Telegraph.co.uk - Telegraph online, Daily Telegraph and Sunday Telegraph Richard Gray 2011
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The previous heavyweight winners were copernicium (285) and roentgenium (272).
Wired Top Stories Mark Brown 2011
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I'll give americium a pass since it goes without saying America rules, but what the hell is roentgenium named after?
Something Awful zackparsons@somethingawful.com (Zack "Geist Editor 2010
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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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kewpid commented on the word roentgenium
formerly known by the placeholder name unununium
September 25, 2007
oroboros commented on the word roentgenium
Rg, also Uuu.
November 26, 2007