Untriseptium

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.

Untriseptium,  137Uts
General properties
Alternative namefeynmanium
Untriseptium in the periodic table
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon
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
Template:Periodic table (32 columns, micro)/119+


Uts

[unennunium
untrihexiumuntriseptiumuntrioctium
Atomic number (Z)137
Groupgroup n/a
Periodperiod 8
Blockg-block-block
Electrons per shell
2, 8, 18, 32, 43, 21, 9, 4
Physical properties
unknown
Phase at STPUts:
Atomic properties
Oxidation statesTemplate:Infobox element/symbol-to-oxidation-state: Symbol "Uts" not known
Other properties
Natural occurrenceUts:
Main isotopes of untriseptium
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct
364Uts syn
| references

The name untriseptium is a temporary name.

Importance

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]

Untriseptium Media

Related pages

References

  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.