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rutherfordium

[ruhth-er-fawr-dee-uh m, -fohr-, ruhth-] /ˌrʌð ərˈfɔr di əm, -ˈfoʊr-, ˌrʌθ-/
noun, Chemistry, Physics.
1.
a superheavy, synthetic, radioactive element with a very short half-life. Symbol: Rf; atomic number: 104.
Formerly unnilquadium, element 104.
Origin
1969
1969; named after English physicist Ernest Rutherford; see -ium
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for rutherfordium

rutherfordium

/ˌrʌðəˈfɔːdɪəm/
noun
1.
a transactinide element produced by bombarding californium-249 nuclei with carbon-12 nuclei. Symbol: Rf; atomic number.: 104; atomic wt: 261 Name in the former Soviet Union kurchatovium
Word Origin
C20: named after Ernest Rutherford
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
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rutherfordium in Science
rutherfordium
  (rŭ'ər-fôr'dē-əm)   
Symbol Rf
A synthetic, radioactive element that is produced by bombarding plutonium with carbon or neon ions. Its most stable isotope is Rf 261 with a half-life of 62 seconds. Atomic number 104. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for rutherfordium

Rf

an artificially produced radioactive transuranium element in Group IVb of the periodic table, atomic number 104. Soviet scientists at the Joint Institute for Nuclear Research at Dubna, Russia, U.S.S.R., announced in 1964 the discovery of element 104, which they named kurchatovium, symbol Ku (for Igor Kurchatov, a Soviet nuclear physicist). In 1969, a group of American researchers at the Lawrence Radiation Laboratory of the University of California at Berkeley announced that they had identified isotopes of the element, different from the one identified by the Soviets; the Americans then proposed the name rutherfordium, in honour of the British physicist Ernest Rutherford

Learn more about Rf with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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