Unbiunium
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| Theoretical element | ||||||
|---|---|---|---|---|---|---|
| Unbiunium | ||||||
| Pronunciation | /ˌuːnbaɪˈuːniəm/ | |||||
| Alternative names | eka-actinium, superactinium | |||||
| Unbiunium in the periodic table | ||||||
| ||||||
| Atomic number (Z) | 121 | |||||
| Group | g-block groups (no number) | |||||
| Period | period 8 (theoretical, extended table) | |||||
| Block | g-block | |||||
| Electron configuration | [Og] 8s2 8p1 (predicted)[1] | |||||
| Electrons per shell | 2, 8, 18, 32, 32, 18, 8, 3 (predicted) | |||||
| Physical properties | ||||||
| Phase at STP | unknown | |||||
| Atomic properties | ||||||
| Oxidation states | common: (none) (+3)[1][2] | |||||
| Ionization energies |
| |||||
| Other properties | ||||||
| CAS Number | 54500-70-8 | |||||
| History | ||||||
| Naming | IUPAC systematic element name | |||||
Unbiunium (/[invalid input: 'icon']uːnbaɪˈuːniəm/), also known as eka-actinium or element 121, is the temporary name of a hypothetical chemical element in the periodic table that has the temporary symbol Ubu and has the atomic number 121.
Unbiunium is the first element whose ground state electron configuration contains an electron in a g subshell, making it the first element in the g-block. However, neither lanthanum nor actinium show such a predicted ground state for the f-block, and lie in the transition metals, so unbiunium's third electron should also hang up. Other elements have access to their g subshells, though not in their ground states. Calculations have shown that 320Ubu would be the most stable isotope.
As of November 2010, no attempt has been made to synthesize unbiunium.
Naming
The name unbiunium is a systematic element name, used as a placeholder until it is confirmed by other research groups and the IUPAC decides on a name. Usually, the name suggested by the discoverer(s) is chosen.
Target-projectile combinations leading to Z=121 compound nuclei
The below table contains various combinations of targets and projectiles which could hypothetically be used to form compound nuclei with atomic number 121.
| Target | Projectile | CN | Attempt result |
|---|---|---|---|
| 238Pu | 62Co | 300Ubu | Reaction yet to be attempted |
| 208Pb | 89Y | 297Ubu | Reaction yet to be attempted |
| 232Th | 71Ga | 303Ubu | Reaction yet to be attempted |
| 238U | 65Cu | 303Ubu | Reaction yet to be attempted |
| 237Np | 64Ni | 301Ubu | Reaction yet to be attempted |
| 244Pu | 59Co | 303Ubu | Reaction yet to be attempted |
| 243Am | 58Fe | 301Ubu | Reaction yet to be attempted |
| 248Cm | 55Mn | 303Ubu | Reaction yet to be attempted |
| 249Bk | 54Cr | 303Ubu | Reaction yet to be attempted |
| 249Cf | 51V | 300Ubu | Reaction yet to be attempted |
| 254Es | 50Ti | 304Ubu | Reaction yet to be attempted |
External links
See also
- ^ a b c 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.
- ^ Amador, Davi H. T.; de Oliveira, Heibbe C. B.; Sambrano, Julio R.; Gargano, Ricardo; de Macedo, Luiz Guilherme M. (12 September 2016). "4-Component correlated all-electron study on Eka-actinium Fluoride (E121F) including Gaunt interaction: Accurate analytical form, bonding and influence on rovibrational spectra". Chemical Physics Letters. 662: 169–175. Bibcode:2016CPL...662..169A. doi:10.1016/j.cplett.2016.09.025. hdl:11449/168956.