118Unknown properties · Group 18 · Period 7
Oganesson
Oganesson (Og) is element 118, a unknown properties in the p-block — group 18, period 7. It is a solid at room temperature with 7 electron shells (2, 8, 18, 32, 32, 18, 8) and an atomic mass of 294 u.
- Atomic mass
- 294.0 u
- Phase · STP
- solid
- Melting
- —
- Boiling
- 350 K · 77 °C
- Electronegativity
- —
- Density
- 4.95 g/cm³
Photograph — Chemical Elements A Virtual Museum under a Creative Commons Attribution 3.0 Unported License, source: https://images-of-elements.com/oganesson.php
Identity
- Atomic number
- 118
- Standard atomic weight
- 294.0 u
- Category
- Unknown properties
- Group
- 18 · Noble gases
- Period
- 7
- Block
- p-block
- Oxidation states
- +6, +4, +2, +1, 0, -1
Physical properties
- Melting point
- —
- Boiling point
- 350 K · 77 °C
- Density
- 4.95 g/cm³
- Molar heat capacity
- —
- Atomic radius
- —
- Electron affinity
- 5.40318 kJ/mol
Atomic structure
118protons
176neutrons
118electrons
8valence e⁻
- Noble-gas notation
- *[Rn] 5f14 6d10 7s2 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
Periodic trends
Where Oganesson ranks across all 118 elements.
Discovery
- Discovered
- 2006
- Discovered by
- Joint Institute for Nuclear Research
- Named by
- —
- Appearance
- —