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Oganesson,  118Og
General properties
Pronunciation
Mass number294 (most stable isotope) (unconfirmed: 295)
Oganesson 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
Rn

Og

(Usb)
tennessineoganessonununennium
Atomic number (Z)118
Groupgroup 18
Periodperiod 7
Blockp-block
Element category  unknown chemical properties, but probably a noble gas
Electron configuration[Rn] 5f14 6d10 7s2 7p6 (predicted)
Electrons per shell
2, 8, 18, 32, 32, 18, 8 (predicted)
Physical properties
Phase at STPOg: Unknown phase (predicted)
Boiling point350±30 K ​(80±30 °C, ​170±50 °F) (extrapolated)
Density when liquid (at m.p.)4.9–5.1 g/cm3 (predicted)
Critical point439 K, 6.8 MPa (extrapolated)
Heat of fusion23.5 kJ/mol (extrapolated)
Heat of vaporization19.4 kJ/mol (extrapolated)
Atomic properties
Oxidation states(−1), (0), (+1), (+2), (+4), (+6)(predicted)
Ionization energies
  • 1st: 860.1 kJ/mol (predicted)
  • 2nd: 1560 kJ/mol (predicted)
Covalent radius157 pm (predicted)
Other properties
Natural occurrenceOg: Synthetic
Crystal structureface-centered cubic (fcc)
Face-centered cubic crystal structure for oganesson

(extrapolated)
CAS Number54144-19-3
History
Namingafter Yuri Oganessian
PredictionNiels Bohr (1922)
DiscoveryJoint Institute for Nuclear Research and Lawrence Livermore National Laboratory (2002)
Main isotopes of oganesson
Iso­tope Abun­dance Half-life (1/2) Decay mode Pro­duct
294Og syn 0.69 ms α 290Lv
SF
295Og syn 181 ms? α 291Lv
| references

Oganesson is a synthetic chemical element with symbol Og and atomic number 118.

The element is named in honor of Yuri Oganessian.

It was first created in 2002 at the Joint Institute for Nuclear Research (JINR) in Dubna, Russia by a joint team of Russian and American scientists.

In December 2015, it was recognized as one of four new elements by the Joint Working Party of the international scientific bodies IUPAC and IUPAP. It was formally named on 28 November 2016. view more...