36 · Kr
Krypton
Isolated by Ramsay and Travers in 1898.
Identity
- Atomic number
- 36
- Symbol
- Kr
- Canonical name
- Krypton
- Category
- noble gas
- Group
- 18
- Period
- 4
- Block
- p
Properties
These quantities come from the Periodic Table JSON compilation. They have not yet been checked, one by one, against CIAAW atomic weights or NIST measurements. A value marked estimated is not a measurement.
- Atomic mass
- 83.7982 u
- Electron configuration
- [Ar] 3d10 4s2 4p6
- Electrons per shell
- 2, 8, 18, 8
- Standard state
- gas
- Density
- 3.749 g/L
- Melting point
- 115.78 K
- Boiling point
- 119.93 K
- Electronegativity
- 3 Pauling
- First ionization energy
- 1,350.8 kJ/mol
- Electron affinity
- -96 kJ/mol
History
Krypton in air residues
Discovery · confirmed · 1898
Ramsay and Travers isolate krypton by distillation of liquid air.
Etymology
- Theme
- property
- Language
- grec
- Root
- kryptos
- Meaning
- hidden
Scientists
Places and institutions
- London — historical setting : United Kingdom — present country : United Kingdom
See also
Sources
- IUPAC, Periodic Table of the Elements
- Bowserinator, Periodic Table JSON. Compilation secondaire d’où viennent les grandeurs physiques importées (masse, densité, températures, énergies). Elles ne sont pas revérifiées une à une auprès du NIST ou de la CIAAW.
- John Emsley, Nature’s Building Blocks: An A–Z Guide to the Elements