Untriseptium

Untriseptium (/ˌuːntraɪˈsɛptiəm/), 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, ₀₀Uts

Untriseptium
Alternative name	feynmanium
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 − ↑ Uts ↓ [unennunium untrihexium ← untriseptium → untrioctium
Electrons per shell	2, 8, 18, 32, 43, 21, 9, 4
Physical properties
unknown
Atomic properties
Oxidation states	(unknown)
Isotopes of untriseptium v e
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Category: Untriseptium view talk edit | 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]

Electronically unstable 1s orbit

Untriseptium has a theoretically impossible electron velocity for the 1s orbital's electrons. This is because when this speed calculated by the formula stated by Bohr's model returns a speed higher than the speed of light and hence is theoretically unviable leading a another reason why it is believed to be the end of the periodic table.

Related pages

• Dubnium
• Atomic orbital