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 |
|
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. |