Unhexoctium

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Unhexoctium, 168Uho
Unhexoctium
Unhexoctium 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
Fl

Uho

(Bbb)
unhexseptium ← unhexoctium → unhexennium
Atomic number (Z)168
Groupgroup 14 (carbon group)
Periodperiod 8
Block
Electrons per shell2, 8, 18, 32, 50, 32, 18, 4, 4
(predicted)
Physical properties
Density (near r.t.)19 g/cm3 (predicted)
Atomic properties
Oxidation states(+4)(predicted)
Ionization energies
  • 1st: 720 kJ/mol (predicted)
Covalent radius180 pm (predicted)
Other properties
Main isotopes of unhexoctium
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct
489Uho syn
| references

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.

As of February 2021, no attempt has ever been made to make unhexoctium.

Naming[change | change source]

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[change | change source]

Unhexoctium is likely to be too unstable to be detected, which would allow very little study of it.

Predicted chemistry[change | change source]

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.

Related pages[change | change source]

References[change | change source]

  1. 1.0 1.1 1.2 "Unhexoctium". Periodic System. Retrieved 2021-02-06.