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Atomic number 94
noun 1.A solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors; 13 isotopes are known with the most important being plutonium 239. Synonyms: plutonium, Pu.
WordNet 3.0 © 2010 Princeton University
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