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element 111

noun, Chemistry, Physics.
Formerly unununium. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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element 111 in Science
element 111  
Symbol Uuu
An artificially produced radioactive element whose isotope has a mass number of 272 and a half-life of 1.5 milliseconds. Atomic number 111. Also called unununium. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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