Ununennium

Ununennium, ₀₀Uue

Ununennium
Pronunciation	/ˌuːn.uːnˈɛniəm/ (listen) ​(OON-oon-EN-ee-əm)
Alternative names	element 119, eka-francium
Ununennium in the periodic table
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Fr ↑ Uue ↓ (Ust) oganesson ← ununennium → unbinilium
Group	group 1: hydrogen and alkali metals
Period	period 8 (theoretical, extended table)
Block	s-block
Electron configuration	[Og] 8s1 (predicted)[1]
Electrons per shell	2, 8, 18, 32, 32, 18, 8, 1 (predicted)
Physical properties
Phase at STP	unknown (could be solid or liquid)[1]
Melting point	273–303 K ​(0–30 °C, ​32–86 °F) (predicted)[1]
Boiling point	903 K ​(630 °C, ​1166 °F) (predicted)[2]
Density (near r.t.)	3 g/cm3 (predicted)[1]
Heat of fusion	2.01–2.05 kJ/mol (extrapolated)[3]
Atomic properties
Oxidation states	(+1), (+3), (+5) (predicted)[1][4]
Electronegativity	Pauling scale: 0.86 (predicted)[5]
Ionization energies	1st: 463.1 kJ/mol 2nd: 1698.1 kJ/mol (predicted)[6]
Atomic radius	empirical: 240 pm (predicted)[1]
Covalent radius	263–281 pm (extrapolated)[3]
Other properties
Crystal structure	​body-centered cubic (bcc) (extrapolated)[7]
CAS Number	54846-86-5
History
Naming	IUPAC systematic element name
Isotopes of ununennium v e
Template:infobox ununennium isotopes does not exist
Category: Ununennium view talk edit | references

Ununennium, or element 119, is a predicted chemical element. Its symbol is Uue. Ununennium and Uue are substitute names made by the IUPAC, (meaning "one-one-nine-ium" in Latin) 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 is thought to be an alkali metal.^[8]

Many attempts have been made by American, German, and Russian teams to make ununennium but all have failed. Japanese and Russian failed to produce the element after work in both 2019 and 2020.

1. ↑ ^{1.0 1.1 1.2 1.3 1.4 1.5} Hoffman, Darleane C.; Lee, Diana M.; Pershina, Valeria (2006). "Transactinides and the future elements". In Morss; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (3rd ed.). Dordrecht, The Netherlands: Springer Science+Business Media. ISBN 978-1-4020-3555-5.
2. ↑ ^{2.0 2.1} Fricke, B.; Waber, J. T. (1971). "Theoretical Predictions of the Chemistry of Superheavy Elements" (PDF). Actinides Reviews. 1: 433–485. Retrieved 7 August 2013.
3. ↑ ^{3.0 3.1} Bonchev, Danail; Kamenska, Verginia (1981). "Predicting the Properties of the 113–120 Transactinide Elements". Journal of Physical Chemistry. 85 (9). American Chemical Society: 1177–1186. doi:10.1021/j150609a021.
4. ↑ Cao, Chang-Su; Hu, Han-Shi; Schwarz, W. H. Eugen; Li, Jun (2022). "Periodic Law of Chemistry Overturns for Superheavy Elements". ChemRxiv (preprint). doi:10.26434/chemrxiv-2022-l798p. Retrieved 16 November 2022.
5. ↑ Pershina, V.; Borschevsky, A.; Anton, J. (20 February 2012). "Fully relativistic study of intermetallic dimers of group-1 elements K through element 119 and prediction of their adsorption on noble metal surfaces". Chemical Physics. 395. Elsevier: 87–94. Bibcode:2012CP....395...87P. doi:10.1016/j.chemphys.2011.04.017. This article gives the Mulliken electronegativity as 2.72, which has been converted to the Pauling scale via χ_P = 1.35χ_M^1/2 − 1.37.
6. ↑ Fricke, Burkhard (1975). "Superheavy elements: a prediction of their chemical and physical properties". Recent Impact of Physics on Inorganic Chemistry. Structure and Bonding. 21: 89–144. doi:10.1007/BFb0116498. ISBN 978-3-540-07109-9. Retrieved 4 October 2013.
7. ↑ Seaborg, Glenn T. (1969). "Prospects for further considerable extension of the periodic table" (PDF). Journal of Chemical Education. 46 (10): 626–634. Bibcode:1969JChEd..46..626S. doi:10.1021/ed046p626. Retrieved 22 February 2018.
8. ↑ "Transuranium element". Encyclopedia Britannica. Retrieved 19 September 2017.