Ununennium, or element 119, is a chemical element. Its symbol on the periodic table is Uue. Ununennium and Uue are substitute names made by the IUPAC, until permanent names are made. Ununennium is the element with the smallest atomic number that has not been created yet. Qualities of Ununennium are unknown, but many are predicted. It is predicted all isotopes will be radioactive. It may be an alkali metal.