Oganesson (Og)
Oganesson is element 118, a noble gas in period 7, group 18 of the periodic table. At room temperature it is of unknown state (too few atoms have ever been made).
Electron configuration [Rn] 5f14 6d10 7s2 7p6
Electrons per shell 2, 8, 18, 32, 32, 18, 8
Oganesson data
| Atomic number | 118 |
|---|---|
| Symbol | Og |
| Atomic mass | [294] (mass number of the longest-lived isotope) |
| Category | Noble gas |
| Group | 18 |
| Period | 7 |
| Block | p |
| State at 25 °C | unknown |
| Melting point | — |
| Boiling point | — |
| Density | — |
| Electronegativity (Pauling) | — |
| Atomic radius | — |
| 1st ionization energy | — |
| Electron affinity | — |
| Oxidation states | 0 |
| Common ion charge | 0 |
| Discovered | 2002 |
Orbital diagram
Each box is one orbital holding up to two electrons of opposite spin. Following Hund’s rule, electrons spread out singly across a subshell before pairing.
Work through oganesson’s configuration and its ions →
Where oganesson sits
Oganesson belongs to the noble gases. To use its mass in a calculation, try the molar mass calculator.
Oganesson FAQ
What is the electron configuration of oganesson?
Oganesson (Z = 118) has the configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p6 5f14 6d10 7s2 7p6. In noble-gas shorthand that is [Rn] 5f14 6d10 7s2 7p6.
How many valence electrons does oganesson have?
8 (full outer shell).
What is the atomic mass of oganesson?
Oganesson has no stable isotopes. Its most stable known isotope has mass number 294, so tables list [294].
Is oganesson a metal?
No. Oganesson is a noble gas.
What is the charge of a oganesson ion?
Oganesson most commonly forms no ions.