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unununium

[uh-nuh-nuhn-ee-uh m] /ə nəˈnʌn i əm/
noun, Chemistry, Physics.
1.
former name of roentgenium. Symbol: Uuu.
Also called element 111.

element 111

noun, Chemistry, Physics.
Formerly unununium.

roentgenium

[rent-gen-ee-uh m, -jen-, ruhnt-] /rɛntˈgɛn i əm, -ˈdʒɛn-, rʌnt-/
noun, Chemistry, Physics.
1.
a superheavy, synthetic radioactive element with a very short half-life. Symbol: Rg; atomic number: 111.
Formerly unununium, element 111.
Origin of roentgenium
named after German physicist Wilhelm Konrad Roentgen; see -ium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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unununium in Science
unununium
  (ə-nə-nŭn'ē-əm)   
See element 111.
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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