| From Wikipedia, the free encyclopediaXenon is a chemical element with symbol Xe and atomic number 54. It is a colorless, dense, odorless noble gas, that occurs in the Earth's atmosphere in trace amounts. Although generally unreactive, xenon can undergo a few chemical reactions such as the formation of xenon hexafluoroplatinate, the first noble gas compound to be synthesized. | |||||||
Xenon in the periodic table | |||||||
|---|---|---|---|---|---|---|---|
| Symbol | Xe | ||||||
| Atomic number | 54 | ||||||
| Group | 18 | ||||||
| Period | 5 | ||||||
| Block | p | ||||||
| Element category | Noble Gas | ||||||
Physical properties | |||||||
| Phase at STP | Gas | ||||||
| Density | 5.894 g/cm3 | ||||||
| Atomic weight | 131.294 u | ||||||
| Melting point | 161.4 K -111.75 °C -169.15 °F | ||||||
| Boiling point | 165.051 K -108.099 °C -162.5782 °F | ||||||
Atomära egenskaper | |||||||
| Electronegativity (Pauling Scale) | 2.6 | ||||||
| Electron affinity | -77 kJ/mol | ||||||
| Ionization energies |
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Electron configuration | |||||||
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 | ||||||
| Electrons per shell | 2, 8, 18, 18, 8 | ||||||
History | |||||||
| Discovered | 1898 | ||||||
| Discovered by | William Ramsay Morris Travers | ||||||