Ununennium

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