Oganesson

1 · Identity

Symbol, number

Og, 118

Oxidation states in water

+6, +4, +2, +1, 0 and -1 listed (book entry); chemistry unknown

Note

Identity from the book entry; nothing measured in water.

Sources

Identity

Name and symbol

Oganesson, Og

Atomic number

118 protons

Position

group 18 · period 7 · p-block · unknown, predicted to be noble gas

CAS number

54144-19-3

Atomic structure

Atomic mass

294 u

Electron configuration

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d¹⁰ 7p⁶
[Rn] 7s² 7p⁶ 5f¹⁴ 6d¹⁰(predicted)

Electrons per shell

2, 8, 18, 32, 32, 18, 8

Valence electrons

8 outer shell

Physical properties

State at room temperature

Expected to be a Gas

Melting point

not in sources

Boiling point

350 K (76.85 °C)

Density

not in sources

Appearance

metallic (predicted)

Thermal conductivity

not in sources

Electrical resistivity

not in sources

Electrical conductivity

not in sources

Crystal structure

face-centered cubic

Molar heat capacity

not in sources

Chemical properties

Oxidation states

-1, 0, +1,+2,+4, +6 ​(predicted)

Electronegativity

not in sources

Ionisation energy

not in sources

Electron affinity

not in sources

Atomic radius

not in sources

Ionic radius

not in sources

Reactivity

The heaviest known element, closing period 7 under radon; only a few atoms with sub-millisecond half-lives have been made, so no chemical experiment has been possible and its properties, including whether it behaves as a noble gas at all, are calculated only.

with water

Not known; no experiment has been reported.

with oxygen, air

Not known; no experiment has been reported.

with acids

Not known; no experiment has been reported.

with halogens

Not known; no experiment has been reported.

Typical compounds

not in sources

Occurrence, production and use

Crustal abundance

Not Applicable

Oceanic abundance

Not Applicable

Occurrence and sources

• synthetic only californium-249 bombarded with calcium-48 ions at Dubna

Extraction, production

not in sources

Uses

Since only a few atoms of oganesson have ever been produced, it currently has no uses outside of basic scientific research.

Safety, toxicity

not in sources

Discovery and name

Discovered by

Joint Institute for Nuclear Research and Lawrence Livermore National Laboratory

Discovered

2002

First isolated

not in sources

Named by

not in sources

Origin of the name

after Yuri Oganessian

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.