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Untriseptium

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Untriseptium, 00Uts
Untriseptium
Alternative namefeynmanium
Untriseptium in the periodic table
Hydrogen Helium
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Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson


Uts

[unennunium
untrihexiumuntriseptiumuntrioctium
Electrons per shell2, 8, 18, 32, 43, 21, 9, 4
Physical properties
unknown
Atomic properties
Oxidation states(unknown)
Isotopes of untriseptium
Template:infobox untriseptium isotopes does not exist
 Category: Untriseptium
| references

Untriseptium (/ˌntrˈsɛptiəm/), also called eka-dubnium[source?] or element 137, is a possible chemical element which has not been synthesized. Due to instabilities, it is not known if this element is possible, as the instabilities may hint that the periodic table ends soon after the island of stability at unbihexium.[1][2] Its atomic number is 137 and symbol is Uts.

The name untriseptium is a temporary name.

Importance

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It is sometimes called feynmanium (symbol Fy) because Richard Feynman noted[3] that a simplistic interpretation of the relativistic Dirac equation runs into problems with electron orbitals at Z > 1/α = 137, suggesting that neutral atoms cannot exist beyond untriseptium, and that a periodic table of elements based on electron orbitals breaks down at this point. However, a more thorough analysis calculates the limit to be around element 173.[4]

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References

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  1. Seaborg, G. T. (c. 2006). "transuranium element (chemical element)". Encyclopædia Britannica. Retrieved 2010-03-16.
  2. Cwiok, S.; Heenen, P.-H.; Nazarewicz, W. (2005). "Shape coexistence and triaxiality in the superheavy nuclei". Nature. 433 (7027): 705–9. Bibcode:2005Natur.433..705C. doi:10.1038/nature03336. PMID 15716943. S2CID 4368001.
  3. Elert, G. "Atomic Models". The Physics Hypertextbook. Retrieved 2009-10-09.
  4. Walter Greiner and Stefan Schramm (2008). "Resource Letter QEDV-1: The QED vacuum". American Journal of Physics. 76 (6): 509. Bibcode:2008AmJPh..76..509G. doi:10.1119/1.2820395., and references therein.