ununennium

Also known as eka-francium, Uue, element 119

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Encyclopedic overview

16 sections

Contents

Introduction
History
Synthesis attempts
Past
Present
Planned
Naming
Predicted properties
Nuclear stability and isotopes
Atomic and physical
Chemical
See also
Notes
References
Bibliography
External links

Ununennium, also known as eka-francium or element 119, is a hypothetical chemical element; it has symbol Uue and atomic number 119. Ununennium and Uue are the temporary systematic IUPAC name and symbol respectively, which are used until the element has been discovered, confirmed, and a permanent name is decided upon. In the periodic table of the elements, it is expected to be an s-block element, an alkali metal, and the first element in the eighth period. It is the lightest element that has not yet been synthesized.

An attempt to synthesize the element has been ongoing since 2018 in RIKEN in Japan. The Joint Institute for Nuclear Research in Dubna, Russia, plans to make an attempt starting in 2026. The Heavy Ion Research Facility in Lanzhou, China (HIRFL) also plans to make an attempt. Theoretical and experimental evidence has shown that the synthesis of ununennium will likely be far more difficult than that of the previous elements.

Excerpted from Wikipedia’s “ununennium” article, available under the CC BY-SA 4.0 licence.