Unhexoctium
Unhexoctium (pronounced /uːnhɛksɒktiəm/), also known as eka-flerovium, dvi-lead, or element 168,[1] is the possible chemical element in the periodic table that has the temporary symbol Uho and has the atomic number 168.[1] Due to instabilities, it is not known if this element is physically possible, but if possible, unhexoctium is predicted to be the last period 8 element in group 14. It should have an atomic mass around 490.
| General properties | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Unhexoctium in the periodic table | |||||||||||
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| Atomic number (Z) | 168 | ||||||||||
| Group | group 14 (carbon group) | ||||||||||
| Period | period 8 | ||||||||||
| Block | p-block | ||||||||||
| Element category | post-transition metals (predicted) | ||||||||||
Electrons per shell | 2, 8, 18, 32, 50, 32, 18, 4, 4 (predicted) | ||||||||||
| Physical properties | |||||||||||
| Phase at STP | Uho: | ||||||||||
| Density (near r.t.) | 19 g/cm3 (predicted) | ||||||||||
| Atomic properties | |||||||||||
| Oxidation states | Template:Infobox element/symbol-to-oxidation-state: Symbol "Uho" not known | ||||||||||
| Ionization energies |
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| Covalent radius | 180 pm (predicted) | ||||||||||
| Other properties | |||||||||||
| Natural occurrence | Uho: | ||||||||||
| Main isotopes of unhexoctium | |||||||||||
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As of October 2022, no attempt has ever been made to make unhexoctium, nor has any plans been made known to attemt to make unhexoctium.
Naming
The name unhexoctium is a systematic element name,[1] 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.
Stability
Unhexoctium is highly likely to be too unstable to be detected, which would allow very little study of it.
Predicted chemistry
Unhexoctium is probably a post-transition metal, although it might be a noble gas. A likely oxidation state is +4, based on the oxidation states of flerovium and lead.
Unhexoctium Media
Pekka Pyykkö's 172-element (extended) periodic table.
Kulsha's first suggested form
Kulsha's second suggested form
Energy eigenvalues (in eV) for the outermost electrons of elements with Z = 100 through 172, predicted using Dirac–Fock calculations. The − and + signs refer to orbitals with decreased or increased azimuthal quantum number from spin–orbit splitting respectively: p− is p1/2, p+ is p3/2, d− is d3/2, d+ is d5/2, f− is f5/2, f+ is f7/2, g− is g7/2, and g+ is g9/2.
Energy eigenvalues for the 1s, 2s, 2p1/2 and 2p3/2 shells from solutions of the Dirac equation (taking into account the finite size of the nucleus) for Z = 135–175 (–·–), for the Thomas-Fermi potential (—) and for Z = 160–170 with the self-consistent potential (---).
Related pages
References
- ↑ 1.0 1.1 1.2 "Unhexoctium". Periodic System. Archived from the original on 2021-03-06. Retrieved 2021-02-06.