54Xe131.29
Xenon
Noble Gas
Gas at STP
Period 5Group 18Block PDiscovered 1898
[Kr]5s2 4d10 5p6
Xenon 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.
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Atomic Properties
| Atomic Number | 54 |
| Atomic Mass | 131.29 u |
| Electron Configuration | [Kr]5s2 4d10 5p6 |
| Oxidation States | 0 |
| Electronegativity | 2.6 (Pauling) |
| Atomic Radius | 216 pm |
| Ionization Energy | 12.13 eV |
| Block | P |
Physical Properties
| Appearance | colorless gas, exhibiting a blue glow when placed in a high voltage electric field |
| Standard State | Gas |
| Melting Point | 161.36 K (-111.8 °C) |
| Boiling Point | 165.03 K (-108.1 °C) |
| Density | 0.005887 g/L |
| CPK Color | #429EB0 |
Classification
| Category | Noble Gas |
| Group Block | Noble gas |
| Period | 5 |
| Group | 18 |
| Block | P |
Discovery
| Year Discovered | 1898 |
| Discovered By | William Ramsay |
| Electron Shells | 2, 8, 18, 18, 8 |