Oganesson (Og)
noble-gasExpected to be a Gas
Peso atomico standard
[294]Configurazione elettronica
[Rn] 7s2 7p6 5f14 6d10 (Previsto)Punto di fusione
N/DPunto di ebollizione
-243,15 °CDensità
7000 kg/m³Stati di ossidazione
−1, 0, +1, +2, +4, +6Elettronegatività (Pauling)
N/DEnergia di ionizzazione (1ª)
N/DAnno della scoperta
2006Raggio atomico
N/DDettagli
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.
No macroscopic sample of oganesson has ever existed, so its appearance, density, melting point, and boiling point are not experimentally known. Predictions often treat it as a condensed, highly polarizable substance under ordinary conditions, but this remains theoretical.
Oganesson has no practical, commercial, medical, or industrial use. Its value is confined to nuclear research, where a few atoms can test models of superheavy nuclei, alpha decay, spontaneous fission, and the limits of the periodic table. The element cannot be stored or accumulated in useful quantities because its known nuclei decay almost immediately after formation.
Since only a few atoms of oganesson have ever been produced, it currently has no uses outside of basic scientific research.
No compound of oganesson has been experimentally prepared or characterized. Its possible chemistry is inferred from relativistic quantum calculations, which predict unusually strong spin-orbit effects and high polarizability for a group 18 element. Hypothetical species such as oganesson difluoride (OgF₂), oganesson tetrafluoride (OgF₄), and oxides have been discussed, but their stability, structures, and oxidation states are not established by experiment.
See more information at the Oganesson compound page.
The immediate hazard of oganesson is radiological rather than chemical. Known atoms decay by alpha emission and through radioactive daughter nuclei on extremely short timescales. Because only a few atoms are produced in shielded accelerator targets, ordinary chemical exposure is not a realistic scenario. Target materials and reaction products require standard controls for radioactive heavy-element experiments.
Oganesson has no confirmed natural occurrence and no known environmental cycle. Any atoms made in laboratories decay long before they could disperse as a chemical contaminant. Environmental considerations are therefore associated with accelerator operations, irradiated targets, and radioactive residues, not with persistent oganesson itself.
Oganesson has no commodity market, no industrial supply chain, and no recoverable stock. It is produced only in specialized nuclear laboratories by bombarding rare actinide targets, notably californium-249 (²⁴⁹Cf), with calcium-48 (⁴⁸Ca) ions. Production depends on scarce target isotopes, long accelerator runs, and detection of individual decay chains. Substitution and recycling are not meaningful concepts for the element itself.
Made by bombarding californium-249 with calcium-48.
Oganesson is not expected to be a persistent cosmic element because its known nuclei are far too unstable. Superheavy nuclei may be formed transiently in extreme nucleosynthetic environments, but no natural or extraterrestrial oganesson has been confirmed. Its relevance to astrophysics is mainly through theoretical work on nuclear stability at very high atomic number.
- Oganesson is the heaviest element with an officially approved name.
- Its placement under radon does not mean its chemistry is known to resemble radon closely.
- The name honors nuclear physicist Yuri Oganessian.
- Individual oganesson atoms are identified through correlated decay chains, not by weighing or isolating the element.
- Relativistic effects are expected to be central to any real oganesson chemistry.
Immagini
Proprietà
Fisiche
- Densità
- 7000 kg/m³ Confronta Densità di tutti gli elementi →
- Fase in condizioni STP
- Gas Confronta Fase in condizioni STP di tutti gli elementi →
- Punto di ebollizione
- -243,15 °C Confronta Punto di ebollizione di tutti gli elementi →
Chimiche
- Affinità elettronica
- 0,056 eV
- Stati di ossidazione
- −1, 0, +1, +2, +4, +6 Confronta Stati di ossidazione di tutti gli elementi →
- Elettroni di valenza
- 8 Confronta Elettroni di valenza di tutti gli elementi →
- Configurazione elettronica
- [Rn] 7s2 7p6 5f14 6d10 (Previsto)
Termodinamiche
N/D
Nucleari
- Protoni
- 118 Confronta Protoni di tutti gli elementi →
- Neutroni
- 175 Confronta Neutroni di tutti gli elementi →
- Isotopi noti
- 2 Confronta Isotopi noti di tutti gli elementi →
- Isotopi stabili
- 0 Confronta Isotopi stabili di tutti gli elementi →
- Numero di massa (isotopo più stabile)
- 294
- Isotopo più stabile
- Og-293
- Anno della scoperta
- 2006
Abbondanza
N/D
Struttura cristallina
N/D
Struttura elettronica
- Elettroni per guscio
- 14, 10, 8 Confronta Elettroni per guscio di tutti gli elementi →
Identificativi
- Numero CAS
- 54144-19-3 Confronta Numero CAS di tutti gli elementi →
- InChI
- InChI=1S/Og
- Chiave InChI
- GOANEQIZDYDFCO-UHFFFAOYSA-N
Configurazione elettronica Previsto
——Dati sulla configurazione elettronica non disponibili per questo ione.
Modello atomico
Gli isotopi modificano il numero di neutroni, la massa e la stabilità — non la configurazione elettronica di un atomo neutro.
N/D
Modello atomico schematico, non in scala.
Impronta atomica
Spettro di emissione / assorbimento
Distribuzione isotopica
Nessun isotopo stabile.
| Numero di massa | Massa atomica (u) | Abbondanza naturale | Emivita |
|---|---|---|---|
| 293 Radioattivo | 293,21356 ± 0,00078 | N/D | 1 ms |
| 294 Radioattivo | 294,21392 ± 0,00071 | N/D | 0.7 ms |
Fase / Stato
Motivo: 268,1 °C sopra il punto di ebollizione (-243,15 °C)
Schema non in scala
Punti di transizione di fase
Densità
In condizioni standard
Stimata con la legge dei gas ideali alla T attuale
Dati sulla struttura cristallina non disponibili per la fase solida
Isotopi (2)
| Numero di massa | Massa atomica (u) | Abbondanza naturale | Emivita | Modalità di decadimento | |
|---|---|---|---|---|---|
| 293 Radioattivo | 293,21356 ± 0,00078 | N/D | 1 ms | α ? | |
| 294 Radioattivo | 294,21392 ± 0,00071 | N/D | 0.7 ms | α ≈100%SF ? |
Proprietà estese
Raggi covalenti (dati estesi)
- Raggio covalente (Pyykkö)
- 157 pm
Scale di numerazione
- Mendeleev
- 118
Polarizzabilità e dispersione
- Polarizzabilità dipolare
- 58 a.u.
- Polarizzabilità dipolare (inc.)
- 6 a.u.
Proprietà dei gas nobili
Categorie degli stati di ossidazione
Dati di riferimento avanzati
Modalità di decadimento degli isotopi (3)
| Isotopo | Modalità | Intensità |
|---|---|---|
| 293 | A | — |
| 294 | A | 100% |
| 294 | SF | — |
Dati aggiuntivi
Estimated Crustal Abundance
The estimated element abundance in the earth's crust.
Not Applicable
Riferimenti (1)
- [5] Oganesson https://education.jlab.org/itselemental/ele118.html
Estimated Oceanic Abundance
The estimated element abundance in the earth's oceans.
Not Applicable
Riferimenti (1)
- [5] Oganesson https://education.jlab.org/itselemental/ele118.html
Riferimenti
(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.