Krypton
Krypton (from Greek:κρυπτός kryptos "the hidden one") is a chemical element with symbol Kr and atomic number 36. It is a member of group 18 (noble gases) elements. A colorless, odorless, tasteless noble gas, krypton occurs in trace amounts in the atmosphere, is isolated by fractionally distilling liquefied air, and is often used with other rare gases in fluorescent lamps.
A stylized shell model. Electrons are quantum objects, not particles following these literal paths. Sizes and motion are illustrative.
18 is the [Ar] core total across three shells.
At a glance
- Atomic number
- 36
- Atomic mass
- 83.7982 u
- Phase
- Gas
- Density
- 3.749 g/L
- Melting point
- 115.78 K
- Boiling point
- 119.93 K
- First ionization energy
- 1,350.8 kJ/mol
- Electronegativity
- 3
- Electron affinity
- -96 kJ/mol
- Molar heat capacity
- Unavailable
- Period
- 4
- Appearance
- colorless gas, exhibiting a whitish glow in a high 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.