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element 104

noun, Chemistry, Physics.
Formerly unnilquadium.
Origin
1975-1980
1975-80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Article for element 104

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

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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