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element 104

noun, Chemistry, Physics.
Formerly unnilquadium.
Origin of element 104
1975-1980
1975-80

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; named after English physicist Ernest Rutherford; see -ium

unnilquadium

[yoo-nil-kwod-ee-uh m] /ˌyu nɪlˈkwɒd i əm/
noun, Chemistry, Physics.
1.
former name of rutherfordium. Symbol: Unq.
Also called element 104.
Origin
1975-80; < Latin ūn(us) one + nīl nothing + quad(ri)- + New Latin -ium -ium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for element 104

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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element 104 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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