Xenon
Xenon is a chemical element with symbol Xe and atomic number 54. It is a colorless, dense, odorless noble gas, that occurs in the Earth's atmosphere in trace amounts. Although generally unreactive, xenon can undergo a few chemical reactions such as the formation of xenon hexafluoroplatinate, the first noble gas compound to be synthesized.
A stylized shell model. Electrons are quantum objects, not particles following these literal paths. Sizes and motion are illustrative.
36 is the [Kr] core total across four shells.
At a glance
- Atomic number
- 54
- Atomic mass
- 131.2936 u
- Phase
- Gas
- Density
- 5.894 g/L
- Melting point
- 161.4 K
- Boiling point
- 165.051 K
- First ionization energy
- 1,170.4 kJ/mol
- Electronegativity
- 2.6
- Electron affinity
- -77 kJ/mol
- Molar heat capacity
- Unavailable
- Period
- 5
- Appearance
- colorless gas, exhibiting a blue glow when placed in a high voltage electric field
Conditions and isotopes affect measured properties. Some properties of short-lived elements are predicted. Electronegativity uses the Pauling scale.
Keep exploring
Explore the stories, imagery, and reference data in more depth. Properties with no value in the reference are marked unavailable.