Unsepttrium

Unsepttrium (/ˌuːnsɛptriəm/), also known as dvi-francium or element 173, is a possible chemical element which has not been observed to occur naturally, nor has it yet been made. 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] however, if possible, it is likely the heaviest possible neutral element. Its atomic number is 173 and its atomic symbol is Ust.

Unsepttrium, 173Ust
Unsepttrium
Unsepttrium 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
Ununennium Unbinilium
Unquadtrium Unquadquadium Unquadpentium Unquadhexium Unquadseptium Unquadoctium Unquadennium Unpentnilium Unpentunium Unpentbium Unpenttrium Unpentquadium Unpentpentium Unpenthexium Unpentseptium Unpentoctium Unpentennium Unhexnilium Unhexunium Unhexbium Unhextrium Unhexquadium Unhexpentium Unhexhexium Unhexseptium Unhexoctium Unhexennium Unseptnilium Unseptunium Unseptbium
Unsepttrium Unseptquadum
Biniltrium Binilunium Binilbium Biniltrium Binilunium Binilbium Biniltrium Binilunium Binilbium Biniltrium Binilunium Binilbium Biniltrium Biunnilium Unpentseptium Unpentoctium Unpentennium Unhexnilium Unhexunium Unhexbium Unhextrium Unhexquadium Unhexpentium Unhexhexium Bibiunium Bibibium Bibiquadium
 Unbiunium Unbibium Unbitrium Unbiquadium Unbipentium Unbihexium Unbiseptium Unbioctium Unbiennium Untrinilium Untriunium Untribium Untritrium Untriquadium Untripentium Untrihexium Untriseptium Untrioctium Untriennium Unquadnilium Unquadunium Unquadbium
Untrioctium Untriennium Unquadnilium Unquadunium Unquadbium Untrioctium Untriennium Unquadnilium Unquadunium Unquadbium Untrioctium Untriennium Unquadnilium Unquadunium Unquadbium Untrioctium Untriennium Unquadnilium Unquadunium Unquadbium Unquadunium Unquadbium
 Uue
↑
Ust
↓
(Bbs)
unseptbium ← unsepttrium → unseptquadium
Atomic number (Z)173
Groupunknown
Periodperiod in the periodic table
Electrons per shell2, 8, 18, 32, 50, 33, 18, 8, 4
(predicted)
Physical properties
Atomic properties
Oxidation statesTemplate:Infobox element/symbol-to-oxidation-state: Symbol "Ust" not known
Other properties
Main isotopes of unsepttrium
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct
512Ust syn

The name unsepttrium is a temporary IUPAC systematic element name.

Significance

Although Richard Feynman noted[2] 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, a more thorough analysis calculates the limit to be Z ≈ 173, meaning that neutral atoms most likely cannot exist with atomic number greater than 173.[3] This makes unsepttrium theoretically the heaviest neutral element possible.

References
  1. Seaborg, G. T. (c. 2006). "transuranium element (chemical element)". Encyclopædia Britannica. Retrieved 2010-03-16.
  2. Elert, G. "Atomic Models". The Physics Hypertextbook. Retrieved 2009-10-09.
  3. See Extended periodic table and untriseptium.
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