Symbol | Xe |
Atomnummer | 54 |
Gruppe | 18 (Ædelgasser) |
Periode | 5 |
Blok | p |
Klassifikation | Ædelgasser |
Udseende | Colorless gas, exhibiting a blue glow when placed in a high voltage electric field |
Farve | Farveløs |
Antal protoner | 54 p+ |
Antal neutroner | 77 n0 |
Antal elektroner | 54 e- |
Fase ved STP | Gas |
Massefylde | 5.894 g/cm3 |
Atommasse | 131.294 u |
Smeltepunkt | 161.4 K -111.75 °C -169.15 °F |
Kogepunkt | 165.051 K -108.099 °C -162.5782 °F |
Fordampningsvarme | 12.64 kJ/mol |
Elektronegativitet (Pauling Scale) | 2.6 |
Elektronaffinitet | -77 kJ/mol |
Oxidationstrin | 0, +1, +2, +4, +6, +8 (rarely more than 0; a weakly acidic oxide) |
Ioniseringsenergier |
|
Opdagelse og første isolation | William Ramsay, Morris Travers (1898) |
Navngivet af | William Ramsay (1898) |
Opdagelse af xenon Xenon was discovered in England by the Scottish chemist William Ramsay and English chemist Morris Travers in September 1898, shortly after their discovery of the elements krypton and neon. They found xenon in the residue left over from evaporating components of liquid air. Ramsay suggested the name xenon for this gas from the Greek word ξένον xénon, neuter singular form of ξένος xénos, meaning 'foreign(er)', 'strange(r)', or 'guest'. |