| Tecken | Kr |
| Atomnummer | 36 |
| Grupp | 18 (Ädelgaser) |
| Period | 4 |
| Block | p |
| Ämnesklass | Ädelgas |
| Utseende | Colorless gas, exhibiting a whitish glow in a high electric field |
| Färg | Färglös |
| Antal protoner | 36 p+ |
| Antal neutroner | 48 n0 |
| Antal elektroner | 36 e- |
| Fas vid STP | Gas |
| Densitet | 3.749 g/cm3 |
| Relativ atommassa | 83.7982 u |
| Smältpunkt | 115.78 K -157.37 °C -251.266 °F |
| Kokpunkt | 119.93 K -153.22 °C -243.796 °F |
| Ångbildningsvärme | 9.029 kJ/mol |
| Elektronegativitet (Paulingskalan) | 3 |
| Elektronaffinitet | -96 kJ/mol |
| Oxidationstal | 0, +1, +2 (rarely more than 0; oxide is unknown) |
| Jonisationspotential |
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| Upptäckt och första isolation | William Ramsay, Morris Travers (1898) |
Upptäckten av krypton Krypton was discovered in Britain in 1898 by William Ramsay, a Scottish chemist, and Morris Travers, an English chemist, in residue left from evaporating nearly all components of liquid air. Neon was discovered by a similar procedure by the same workers just a few weeks later. William Ramsay was awarded the 1904 Nobel Prize in Chemistry for discovery of a series of noble gases, including krypton. | |