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Oganesson (Og) – Element 118 of the periodic table

Oganesson (symbol Og) is element number 118 of the periodic table and belongs to the “Noble gas” category. Its atomic mass is about 294, and its phase under standard conditions is Solid (a theoretical prediction). This element sits in period 7 and group 18 of the periodic table, and its electrons are arranged in shells of 2, 8, 18, 32, 32, 18, 8. The short electron configuration of Oganesson is [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁶. Known uses of Oganesson include Scientific research.

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Oganesson is a radioactive, mostly synthetic element; its data may be based on limited experiments or theoretical prediction.

Properties of Oganesson

Atomic number
118
Chemical symbol
Og
Atomic mass
294
Category
Noble gas
Period
7
Group
18
Phase
Solid (a theoretical prediction)
Protons
118
Electrons
118
Neutrons (approx.)
176
Electron shells
2, 8, 18, 32, 32, 18, 8
Outer-shell electrons
8
Discovered
Dubna Research Institute (2002)

Electron configuration of Oganesson

The electron configuration of Oganesson (Og), with 118 electrons, is shown below. The last shell (shell 7) is highlighted:

Full configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 6d¹⁰ 7s² 7p⁶
Short configuration
[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁶
Last shell
7s² 7p⁶

This synthetic element’s electron configuration is a theoretical prediction.

What is electron configuration and how is it written?

Electron shells of Oganesson

Distribution of 118 electrons of Oganesson across shells K to Q:

  1. K2
  2. L8
  3. M18
  4. N32
  5. O32
  6. P18
  7. Q8

What is a noble gas?

The noble gases are the group 18 elements: their outer shell is full, so under normal conditions they are very unreactive.

Uses of Oganesson

Frequently asked questions about Oganesson

What is the atomic number of Oganesson?

The atomic number of Oganesson (Og) is 118; that is, every atom of it has 118 protons.

What is the electron configuration of Oganesson?

The electron configuration of Oganesson (Og) is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 6d¹⁰ 7s² 7p⁶; in short form it is [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁶, and its last shell is 7s² 7p⁶.

What is the chemical symbol of Oganesson?

The chemical symbol of Oganesson is Og.

Where is Oganesson located in the periodic table?

Oganesson is located in period 7 and group 18 and belongs to the “Noble gas” category.

What is the atomic mass of Oganesson?

The atomic mass of Oganesson is about 294 (atomic mass units).

What is the phase of Oganesson under normal conditions?

The phase of Oganesson under standard conditions is Solid (a theoretical prediction).

What are the uses of Oganesson?

Uses of Oganesson include Scientific research.

Who discovered Oganesson?

Oganesson was discovered by Dubna Research Institute in 2002.

Elements in the same category as Oganesson (Noble gas)

Helium (He)Neon (Ne)Argon (Ar)Krypton (Kr)Xenon (Xe)Radon (Rn)

See all Noble gases

Oganesson’s group 18 neighbours

Helium (He)Neon (Ne)Argon (Ar)Krypton (Kr)Xenon (Xe)Radon (Rn)

Group 18 of the periodic table