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atomic number 94

ato·mic·num·ber

uncommon

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

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WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.