Ununennium
| Ununennium | ||||||
|---|---|---|---|---|---|---|
| Pronunciation | /ˌuːn.uːnˈɛniəm/ | |||||
| Alternative names | element 119, eka-francium | |||||
| Ununennium in the periodic table | ||||||
| ||||||
| Group | group 1: hydrogen and alkali metals | |||||
| Period | period 8 (theoretical, extended table) | |||||
| Block | s-block | |||||
| Electron configuration | [Og] 8s1 (predicted) | |||||
| Electrons per shell | 2, 8, 18, 32, 32, 18, 8, 1 (predicted) | |||||
| Physical properties | ||||||
| Phase at STP | unknown (could be solid or liquid) | |||||
| Melting point | 273–303 K (0–30 °C, 32–86 °F) (predicted) | |||||
| Boiling point | 903 K (630 °C, 1166 °F) (predicted) | |||||
| Density (near r.t.) | 3 g/cm3 (predicted) | |||||
| Heat of fusion | 2.01–2.05 kJ/mol (extrapolated) | |||||
| Atomic properties | ||||||
| Oxidation states | (+1), (+3), (+5) (predicted) | |||||
| Electronegativity | Pauling scale: 0.86 (predicted) | |||||
| Ionization energies |
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| Atomic radius | empirical: 240 pm (predicted) | |||||
| Covalent radius | 263–281 pm (extrapolated) | |||||
| Other properties | ||||||
| Crystal structure | body-centered cubic (bcc) (extrapolated) | |||||
| CAS Number | 54846-86-5 | |||||
| History | ||||||
| Naming | IUPAC systematic element name | |||||
| Isotopes of ununennium | ||||||
| Template:infobox ununennium isotopes does not exist | ||||||
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.
Many attempts have been made by American, German, and Russian teams to make ununennium but all have failed. Japanese and Russian teams failed to produce the element after work in both 2019 and 2020. The work of the Japanese team is ongoing, although no atoms of ununennium have ever been observed.
Predicted chemistry
Ununennium's spot on the periodic table is a sign that it may be similar to lighter elements such as lithium, sodium, potassium, rubidium, caesium, and francium; however, some of its properties may be different from what is expected. For example, ununennium might be less reactive than caesium and francium and will behave more like potassium or rubidium.
Uses
As of 2026, it has not been made and has no use.
References
- 1 2 3 4 5 6 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.
- ↑ Fricke, B.; Waber, J. T. (1971). "Theoretical Predictions of the Chemistry of Superheavy Elements" (PDF). Actinides Reviews. 1: 433–485. Retrieved 7 August 2013.
- 1 2 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.
- ↑ 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.
- ↑ 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 χP = 1.35χM1/2 − 1.37.
- ↑ 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.
{{cite journal}}: CS1 maint: periodical has ISBN (link) - ↑ 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.
- ↑ "Transuranium element". Encyclopedia Britannica. Retrieved 19 September 2017.
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