Global InformationUnbibium information
| Theoretical element | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Unbibium | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Pronunciation | /ˌuːnbaɪˈbaɪəm/ | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Alternative names | element 122, eka-thorium | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Unbibium in the periodic table | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Atomic number (Z) | 122 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Group | g-block groups (no number) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Period | period 8 (theoretical, extended table) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Block | g-block | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Electron configuration | predictions vary, see text | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Physical properties | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Phase at STP | unknown | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Atomic properties | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Oxidation states | (+4) (predicted)[1] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Ionization energies |
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Other properties | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| CAS Number | 54576-73-7 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| History | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Naming | IUPAC systematic element name | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Unbibium, also known as element 122 or eka-thorium, is a hypothetical chemical element; it has placeholder symbol Ubb and atomic number 122. Unbibium and Ubb are the temporary systematic IUPAC name and symbol respectively, which are used until the element is discovered, confirmed, and a permanent name is decided upon. In the periodic table of the elements, it is expected to follow unbiunium as the second element of the superactinides and the fourth element of the 8th period. Similarly to unbiunium, it is expected to fall within the range of the island of stability, potentially conferring additional stability on some isotopes, especially 306Ubb which is expected to have a magic number of neutrons (184).
Despite several attempts, unbibium has not yet been synthesized, nor have any naturally occurring isotopes been found to exist. There are currently no plans to attempt to synthesize unbibium. In 2008, it was claimed to have been discovered in natural thorium samples,[3] but that claim has now been dismissed by recent repetitions of the experiment using more accurate techniques.
Chemically, unbibium is expected to show some resemblance to cerium and thorium. However, relativistic effects may cause some of its properties to differ; for example, it is expected to have a ground state electron configuration of [Og] 7d1 8s2 8p1 or [Og] 8s2 8p2, despite its predicted position in the g-block superactinide series.[1]
- ^ a b Pyykkö, Pekka (2011). "A suggested periodic table up to Z ≤ 172, based on Dirac–Fock calculations on atoms and ions". Physical Chemistry Chemical Physics. 13 (1): 161–8. Bibcode:2011PCCP...13..161P. doi:10.1039/c0cp01575j. PMID 20967377.
- ^ a b Eliav, E.; Fritzsche, S.; Kaldor, U. (2015). "Electronic structure theory of the superheavy elements". Nuclear Physics A. 944 (December 2015): 518–550. doi:10.1016/j.nuclphysa.2015.06.017.
- ^ Marinov, A.; Rodushkin, I.; Kolb, D.; et al. (2010). "Evidence for a long-lived superheavy nucleus with atomic mass number A=292 and atomic number Z=~122 in natural Th". International Journal of Modern Physics E. 19 (1): 131–140. arXiv:0804.3869. Bibcode:2010IJMPE..19..131M. doi:10.1142/S0218301310014662. S2CID 117956340.