Oganesson (Og)
noble-gasExpected to be a Gas
Standard Atomic Weight
[294]Electron configuration
[Rn] 7s2 7p6 5f14 6d10(predicted)Melting point
N/ABoiling point
-243.15 °C (30 K)Density
7000 kg/m³Oxidation states
−1, 0, +1, +2, +4, +6Electronegativity (Pauling)
N/AIonization energy (1st)
Discovery year
2006Atomic radius
N/ADetails
Oganesson is a synthetic element at the end of period 7 and is placed in group 18 with the noble gases. It has been made only atom by atom in heavy-ion fusion experiments, with the best-established isotope, ²⁹⁴Og, decaying in about a millisecond. Its chemistry has not been observed directly. Relativistic calculations suggest that it may be far less inert than lighter noble gases.
Oganesson does not occur naturally in the Earth’s crust. The name oganesson and symbol Og are the accepted ones for element 118. The name is in line with the tradition of honoring a scientist and recognizes Prof. Yuri Oganessian (Fig. IUPAC.118.1; born 1933) for his pioneering contribution to trans-actinoid element research. His many achievements include the discovery of super-heavy elements and significant advances in the nuclear physics of super-heavy nuclei, including experimental evidence for the “island of stability.”
In 2005, experiments were performed in Dubna’s U-400 cyclotron, where 48Ca bombarded a spinning target of 249Cf at nearly 3×104 km/s to produce oganesson. With the success of creating oganesson, scientists from Livermore and Joint Institute for Nuclear Research (JINR) are starting experiments to create element 120 by bombarding a 244Pu target with a beam of 58Fe [680], [681], [682], [683]. Oganesson has no known isotopic applications aside from scientific research.
On October 16, 2006, scientists working at the Joint Institute for Nuclear Research in Dubna, Russia, along with scientists from the U.S. Department of Energy's Lawrence Livermore National Laboratory, announced the creation of oganesson. They produced oganesson by bombarding atoms of californium-249 with ions of calcium-48. This produced oganesson-294, an isotope with a half-life of about 0.89 milliseconds (0.00089 seconds), and three free neutrons. The californium target was irradiated with a total of 1.6*1019 calcium ions over the course of 1080 hours, resulting in the production of three atoms of oganesson. Oganesson's most stable isotope, oganesson-294, has a half-life of about 0.89 milliseconds. It decays into livermorium-290 through alpha decay.
On Novemer 28th, 2016, element 118 was named Oganesson with the symbol (Og). The name was proposed by the Joint Institute for Nuclear Research, Dubna (Russia) and Lawrence Livermore National Laboratory (USA). It honors Professor Yuri Oganessian (born 1933) for his pioneering contributions to transactinoid elements research.
Images
Properties
Physical
Chemical
Thermodynamic
N/A
Nuclear
Abundance
N/A
Reactivity
N/A
Crystal Structure
N/A
Electronic Structure
Identifiers
Electron Configuration Predicted
——Electron configuration data not available for this ion.
Atomic model
Isotopes change neutron count, mass, and stability — not the electron configuration of a neutral atom.
N/A
Schematic atomic model, not to scale.
Atomic Fingerprint
Emission / Absorption Spectrum
Isotope Distribution
No stable isotopes.
| Mass number | Atomic mass (u) | Natural abundance | Half-life |
|---|---|---|---|
| 293 Radioactive | 293.21356 ± 0.00078 | N/A | 1 ms |
| 294 Radioactive | 294.21392 ± 0.00071 | N/A | 0.7 ms |
| 295 Radioactive | 295.21624 ± 0.00069 | N/A | 680 ms |
Phase / State
Reason: 268.1 °C above boiling point (-243.15 °C)
Schematic, not to scale
Phase transition points
Density
At standard conditions
Estimated via ideal gas law at current T
Crystal structure data not available for solid phase
Isotopes (3)
| Mass number | Atomic mass (u) | Natural abundance | Half-life | Decay mode | |
|---|---|---|---|---|---|
| 293 Radioactive | 293.21356 ± 0.00078 | N/A | 1 ms | α ? | |
| 294 Radioactive | 294.21392 ± 0.00071 | N/A | 0.7 ms | α ≈100%SF ? | |
| 295 Radioactive | 295.21624 ± 0.00069 | N/A | 680 ms | α ≈100% |
Extended Properties
Covalent Radii (Extended)
Numbering Scales
Polarizability & Dispersion
Noble Gas Properties
Oxidation State Categories
Advanced Reference Data
Isotope Decay Modes (4)
| Isotope | Mode | Intensity |
|---|---|---|
| 293 | A | — |
| 294 | A | 100% |
| 294 | SF | — |
| 295 | A | 100% |
Additional Data
Estimated Crustal Abundance
The estimated element abundance in the earth's crust.
Not Applicable
References (1)
- [5] Oganesson https://education.jlab.org/itselemental/ele118.html
Estimated Oceanic Abundance
The estimated element abundance in the earth's oceans.
Not Applicable
References (1)
- [5] Oganesson https://education.jlab.org/itselemental/ele118.html
References
(8)
Data deposited in or computed by PubChem
The half-life and atomic mass data was provided by the Atomic Mass Data Center at the International Atomic Energy Agency.
Element data are cited from the Atomic weights of the elements (an IUPAC Technical Report). The IUPAC periodic table of elements can be found at https://iupac.org/what-we-do/periodic-table-of-elements/. Additional information can be found within IUPAC publication doi:10.1515/pac-2015-0703 Copyright © 2020 International Union of Pure and Applied Chemistry.
The information are cited from Pure Appl. Chem. 2018; 90(12): 1833-2092, https://doi.org/10.1515/pac-2015-0703.
Thomas Jefferson National Accelerator Facility (Jefferson Lab) is one of 17 national laboratories funded by the U.S. Department of Energy. The lab's primary mission is to conduct basic research of the atom's nucleus using the lab's unique particle accelerator, known as the Continuous Electron Beam Accelerator Facility (CEBAF). For more information visit https://www.jlab.org/
The periodic table at the LANL (Los Alamos National Laboratory) contains basic element information together with the history, source, properties, use, handling and more. The provenance data may be found from the link under the source name.
The periodic table contains NIST's critically-evaluated data on atomic properties of the elements.
This section provides all form of data related to element Oganesson.