Oganesson (Og): Electron Configuration and Properties
Oganesson (Og): Electron Configuration and Properties
Electron configuration [Rn] 7s2 5f14 6d10 7p6 · group 18 · period 7 · Ar [294]
Oganesson data
- Atomic number
- 118
- Relative atomic mass
- [294]
- Group
- 18
- Period
- 7
- Block
- p
- Category
- Noble gas
- Electron configuration
- [Rn] 7s2 5f14 6d10 7p6
- Full configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10 7p6
- Electrons per shell
- 2, 8, 18, 32, 32, 18, 8 (K L M N O P Q)
- Valence electrons
- 8
- Electronegativity (Pauling)
- no data
- First ionisation energy
- no data
- Atomic radius (van der Waals)
- no data
- State at room temperature
- Gas (predicted)
- Melting point
- no data
- Boiling point
- no data
- Density
- no data
- Common oxidation states
- +6, +4, +2, +1, 0, −1
- Discovered
- 2006
Source: PubChem (NIH, accessed 13 Nov 2026); atomic mass: IUPAC standard atomic weight.
Electron shell diagram
K 2 · L 8 · M 18 · N 32 · O 32 · P 18 · Q 8
Orbital diagram (outer electrons)
About oganesson
With atomic number 118, oganesson (Og) has 118 protons in its nucleus and 118 electrons as a neutral atom. It is a noble gas in group 18, period 7, p-block. Oganesson was first discovered in 2006. It is named after Yuri Oganessian, one of only two people to have an element named after them while alive. Its bulk properties have never been measured because only a few atoms have been made; it is expected to be a gas at room temperature.
Oganesson electron configuration
The electron configuration of oganesson is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10 7p6, or in short [Rn] 7s2 5f14 6d10 7p6. Its electrons occupy 7 shells: K = 2, L = 8, M = 18, N = 32, O = 32, P = 18, Q = 8. Oganesson has 8 valence electrons in the Q shell (7s2 7p6), which is why it sits in group 18. For this superheavy element the configuration is a theoretical prediction.
Filling order: 1s2(2) → 2s2(4) → 2p6(10) → 3s2(12) → 3p6(18) → 4s2(20) → 3d10(30) → 4p6(36) → 5s2(38) → 4d10(48) → 5p6(54) → 6s2(56) → 4f14(70) → 5d10(80) → 6p6(86) → 7s2(88) → 5f14(102) → 6d10(112) → 7p6(118)
Uses of oganesson
Oganesson has no practical use outside research, because it can only be made a few atoms at a time in particle accelerators.
Safety
Only a handful of oganesson atoms have ever been made and they decay very quickly, so it is never handled in an ordinary laboratory.
Other elements in group 18
Frequently asked questions
What is the electron configuration of oganesson?
The electron configuration of oganesson (Og, atomic number 118) is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10 7p6, or [Rn] 7s2 5f14 6d10 7p6 in short. By shell: 2, 8, 18, 32, 32, 18, 8.
How many valence electrons does oganesson have?
Oganesson has 8 valence electrons.
Which group and period is oganesson in?
Oganesson is in group 18, period 7, p-block.
What is the atomic mass of oganesson?
Oganesson has no stable isotope, so the mass number of its longest-lived isotope, [294], is given.
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