Ununennium
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Ununennium (eka-francium) is the temporary name of an undiscovered chemical element in the periodic table that has the temporary symbol Uue and has the atomic number 119. Like other alkali metals, it would most likely be extremely reactive with water and even explode in air at room temperatures. Interestingly, it would be the first radioactive liquid (if guesses are right, although ununbium is also predicted to be a liquid) to be discovered. There are radioactive solids, and radon is a gas but there are no liquids (except possibly ununbium). It would also be only the second liquid metal (the other being mercury).
Element 119 would be the first element in the eighth period of the periodic table.
Ignoring instability due to likely radioactivity, scientists would expect that, when it had formed the usual ionic compounds, the alkali metal ion Uue+ would react like xenon or ununoctium and form covalent compounds such as Uue+F2, and that over the eighth and ninth periods of the periodic table, the boundaries between the periods would get fuzzy.
History
The name ununennium is used as a placeholder, such as in scientific articles about the search for element 119. Such transuranic elements are always artificially produced, and usually end up being named for a scientist.