Element 54
Xenon (Xe)
Xenon (Xe) is element 54 of the periodic table, a noble gas in period 5, group 18 (p-block) with an atomic mass of 131.29 and is a gas at standard conditions.
At a glance
- Atomic number
- 54
- Symbol
- Xe
- Atomic mass
- 131.29 u
- Category
- Noble gases
- Period
- 5
- Group
- 18
- Block
- p-block
- Phase at STP
- gas
Electron structure
- Electron configuration
- 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6
- Shorthand configuration
- [Kr] 4d10 5s2 5p6
- Electrons per shell
- 2, 8, 18, 18, 8
- Oxidation states
- 0, +2, +4, +6, +8
Physical properties
- Melting point
- 161.4 K
- Boiling point
- 165.03 K
- Density
- 0.005887 g/cm3
- Phase
- gas
Atomic properties
- Electronegativity (Pauling)
- 2.6
- Atomic radius
- 108 pm
- Covalent radius
- 140 pm
- Van der Waals radius
- 216 pm
- First ionization energy
- 1170 kJ/mol
- Electron affinity
- 0 kJ/mol
Notable isotopes
| Isotope | Mass | Abundance | Stability |
|---|---|---|---|
| Xe-132 | 131.90415 | 26.89% | Stable |
Common uses
- Lighting
- Anesthesia
- Ion propulsion
- Medical imaging
Discovery
- Year
- 1898
- Discovered by
- William Ramsay, Morris Travers
- Country
- England