Ununennium, Element Number 119

Ununennium is an undiscovered element with the symbol Uue and the atomic number 119. Ununennium and Uue are the temporary systematic IUPAC name and symbol until a permanent name is decided. It was not physically made and tested in a lab much like oganesson and tennessine and it is believed that it will be an s-block and in the alkaline metal group. The name Ununennium is widely used from chemistry classrooms to advanced textbooks, this name is mostly ignored among scientists who work theoretically or experimentally on superheavy elements, they call it “element 119”, with the symbol (119).

The synthesis of Ununennium was first attempted in 1985 by bombarding a target of einsteinium-254 with calcium-48 ions at the superHILAC accelerator at Berkeley, California. Experimental evidence has shown that the synthesis of Ununennium will likely be far more difficult than that of the previous elements. To this date, multiple attempts to synthesize this element have been made by American, German, and Russian but they all have been unsuccessful. If Ununennium atoms were successfully synthesized, they could have different traits generally due to having the most unstable and radioactive structures. Ununennium is the element with the smallest atomic number that has not yet been synthesized.

119 Element in Periodic Table, Element Uue

Ununennium is predicted to continue the trend and have a valence electron configuration of 8s1. Therefore, its position as the seventh alkali metal advocates that it would have similar properties to the alkaline metals such as lithium, sodium, potassium, rubidium, cesium, and francium; however, relativistic effects may cause some of its properties to differ from those expected from a straight application of periodic trends.

The main reason for the predicted differences between Ununennium and the other alkali metals is the spin–orbit (SO) interaction at velocities comparable to the speed of light—than those in lighter atoms. In Ununennium atoms, it lowers the 7p and 8s electron energy levels, stabilizing the corresponding electrons, but two of the 7p electron energy levels are more stabilized than the other four. The effect is called subshell splitting, as it splits the 7p subshell into more stabilized and the less stabilized parts.