Ununennium is a synthetic element with the temporary symbol Uue and atomic number 119. It is part of the alkali metals group in the periodic table and is predicted to be highly reactive. As a superheavy element, it has not yet been observed in nature and can only be created in laboratories through nuclear reactions. Due to its position in the periodic table, ununennium is expected to exhibit properties similar to those of francium, the heaviest naturally occurring alkali metal. However, its exact characteristics remain largely theoretical, as it has not been produced in significant quantities for study.