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Email: info@yycheme.com Tel: +86-19304758719
Oganesson (Og) — Element 118
Oganesson is a synthetic superheavy element with atomic number 118. It is the heaviest known element on the periodic table and is placed in Group 18, the noble gas group. However, due to extreme relativistic effects, oganesson is not expected to behave as a typical noble gas.
Oganesson does not occur naturally and has only been produced in particle accelerator experiments. It is highly unstable, with all known isotopes having extremely short half-lives. The most well-characterized isotope, oganesson-294, has a half-life on the order of milliseconds.
Oganesson is not available for commercial supply, sale, or distribution. This page is provided for scientific reference and educational purposes only.
Parameter | Details |
Element Name | Oganesson |
Symbol | Og |
Atomic Number | 118 |
Atomic Mass | 294 (most well-characterized isotope, ²⁹⁴Og) |
Element Category | Superheavy element, synthetic element |
Group | 18 (noble gas group) |
Period | 7 |
Block | p-block |
Electron Configuration | Predicted: [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁶ |
Discovery | First synthesized in 2002 (confirmed 2006), Joint Institute for Nuclear Research (JINR), Dubna, Russia, in collaboration with Lawrence Livermore National Laboratory (LLNL), USA |
Named After | Yuri Oganessian, Armenian-Russian nuclear physicist |
Commercial Availability | Not available |
Property | Details |
Predicted Phase at STP | Uncertain; may be solid or liquid due to relativistic effects |
Predicted Appearance | Unknown |
Predicted Density | Estimated ~7–10 g/cm³ (theoretical) |
Predicted Melting Point | Not experimentally determined |
Predicted Boiling Point | Not experimentally determined |
Chemical Reactivity | Predicted to be more reactive than lighter noble gases due to relativistic effects; may not exhibit typical noble gas inertness |
Oxidation States | Predicted: 0, +2, +4, +6 (theoretical) |
Oganesson has been produced by bombarding californium-249 targets with calcium-48 ion beams in particle accelerators:
²⁴⁹Cf + ⁴⁸Ca → ²⁹⁴Og + 3n
Only a few atoms of oganesson have ever been produced. The element exists for fractions of a second before decaying through alpha decay or spontaneous fission.
Isotope | Half-Life | Decay Mode |
²⁹⁴Og | ~0.89 ms | Alpha decay, spontaneous fission |
No stable or long-lived isotopes of oganesson are known.
Oganesson has no practical applications outside of fundamental nuclear physics research. Its study contributes to:
· Understanding the limits of the periodic table
· Testing nuclear structure models
· Investigating relativistic effects in superheavy elements
· Exploring the "island of stability" hypothesis
Item | Details |
Commercial Availability | Not available for sale, supply, or distribution |
Production Method | Particle accelerator synthesis only |
Regulatory Note | Oganesson can only be produced in specialized nuclear research facilities. It cannot be stored, transported, or used in any commercial or industrial context. |
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