| Unbipentium | ||||||
|---|---|---|---|---|---|---|
| Pronunciation | /ˌuːnbaɪˈpɛntiəm/ | |||||
| Unbipentium in the periodic table | ||||||
| ||||||
| Group | g-block groups (no number) | |||||
| Period | period 8 (theoretical, extended table) | |||||
| Block | g-block | |||||
| Electrons per shell | 2, 8, 18, 32, 37, 18, 8, 2 (predicted) | |||||
| Physical properties | ||||||
| Phase at STP | unknown | |||||
| Atomic properties | ||||||
| Oxidation states | (+1), (+6), (+7) (predicted)[1] | |||||
| Isotopes of unbipentium | ||||||
| Template:infobox unbipentium isotopes does not exist | ||||||
Unbipentium, also known as element 125 or eka-neptunium, is the hypothetical chemical element with atomic number 125 and placeholder symbol Ubp. Unbipentium and Ubp are the temporary IUPAC name and symbol, respectively, until the element is discovered, confirmed, and a permanent name is decided upon. In the periodic table, unbipentium is expected to be a g-block superactinide and the eighth element in the 8th period. Unbipentium has attracted attention among nuclear physicists, especially in early predictions targeting properties of superheavy elements, for 125 may be a magic number of protons near the center of an island of stability, leading to longer half-lives, especially for 332Ubp or 354Ubh which may also have magic numbers of neutrons.[2]
Early interest in possible increased stability led to the first attempted synthesis of unbipentium in 2010 and searches for it in nature in subsequent years. Despite several reported observations, more recent studies suggest that these experiments were insufficiently sensitive; hence, no unbipentium has been found naturally or artificially.[3] Predictions of the stability of unbihexium vary greatly among different models; some suggest the island of stability may instead lie at a lower atomic number, closer to neptunium and tin.
Unbipentium is predicted to be a chemically active superactinide, exhibiting a variety of oxidation states from +1 to +8, and possibly being a heavier congener of [[neptunium]. It is predicted to be the first element with an electron in a g orbital, a consequence of relativistic effects seen only in heavy and superheavy elements. An overlap in energy levels of the 5g, 6f, 7d, and 8p orbitals is also expected, which complicates predictions of chemical properties for this element.
Unbipentium, also known as eka-neptunium, is the hypothetical chemical element with the atomic number 125 and symbol Ubp. Calculations predict that 332Ubp would be the most stable unbipentium isotope. To date, no attempt has ever been made to synthesize element 125.
Naming
editThe name unbipentium 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.
Predicted chemistry
editUnbipentium might be extremely reactive and similar to neptunium. A likely oxidation sttate is +7 (based on that of neptunium). It might form a hexafluoride (UbpF6) like neptunium.
Electron configuration
editLeonard I. Schiff predicted that unbipentium will have the electron configuration [Uuo] 8s2 7d1 5g4.
See also
edit
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- ^ 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.
- ^ Cite error: The named reference
SHquestwas invoked but never defined (see the help page). - ^ Cite error: The named reference
Transuraniumpplwas invoked but never defined (see the help page).