54Xe131.29
Xenon (Xe)
Element 54 · Noble gas
Xenon (Xe) is a chemical element with atomic number 54. It is classified as a noble gas in period 5, group 18 of the periodic table (the p-block). Its standard atomic weight is 131.29 u and its ground-state electron configuration is [Kr] 4d¹⁰ 5s² 5p⁶.
Xenon facts
| Atomic number (Z) | 54 |
|---|---|
| Symbol | Xe |
| Standard atomic weight | 131.29 u |
| Category | Noble gas |
| Group | 18 |
| Period | 5 |
| Block | p-block |
| Electron configuration | [Kr] 4d¹⁰ 5s² 5p⁶ |
| Electronegativity (Pauling) | 2.6 |
| State at 20 °C | Gas |
| Protons / electrons | 54 / 54 |
| Neutrons (most common isotope, approx.) | 77 |
| Molar mass | 131.29 g/mol |