ununoctium

Noun

ununoctium (uncountable)

1. (dated) The systematic element name for the chemical element with atomic number 118 (symbol Uuo); now named oganesson.
   • “The chemistry community is eager to see its most cherished table finally being completed down to the seventh row. IUPAC has now initiated the process of formalizing names and symbols for these elements temporarily named as ununtrium, (Uut or element 113), ununpentium (Uup, element 115)...2015 December 30, “Discovery and Assignment of Elements with Atomic Numbers 113, 115, 117 and 118”, in IUPAC
   • Prior to and during the naming process, the element may be referred to by its atomic number, for example as in ‘element 118’, or by its provisional systematic name, ‘ununoctium’.2016 March 1, Willem H. Koppenol, John Corish, Javier García-Martínez, Juris Meija and Jan Reedijk, “How to name new chemical elements (IUPAC Recommendations 2016)”, in Pure and Applied Chemistry...

   Synonyms:

   eka-radon, oganesson