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Ununoctium [1] (eka-radon or element 118) is the temporary IUPAC for the transactinide element of atomic number 118 and temporary element symbol Uuo.[2] An ununoctium atom is very unstable, meaning it quickly changes to another atom (nuclear reaction). Only three atoms of ununoctium have been produced since 2002. Although it is a noble gas, it is more reactive than other noble gases.


  1. "Ununoctium". Columbia Encyclopedia. Retrieved 2008-01-18. "Pronounced yoo'nànŏk`tēàm"
  2. M.E. Wieser (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry 78 (11): 2051–2066. doi:10.1351/pac200678112051 .