Xe
Xenon
Xenon is a chemical element with the symbol Xe and atomic number 54. It has a standard atomic weight of 131.29, sits in period 5 and group 18, and is classified as a noble gas.
Properties
| Symbol | Xe |
|---|---|
| Atomic number | 54 |
| Standard atomic weight | 131.29 |
| Category | Noble gas |
| Group | 18 |
| Period | 5 |
| Electron configuration | [Kr] 4d10 5s2 5p6 |
| Outer-shell electrons | 8 |
The figure of 131.29 is a standard atomic weight.
Compounds containing xenon
1 of the compounds in this reference contain Xe, listed by the fraction of their mass it makes up.
| Compound | Formula | Atoms | % by mass |
|---|---|---|---|
| xenon tetrafluoride | F4Xe | 1 | 63.3% |
Calculate with xenon
- Molar mass of any formula containing it
- Electron configuration, including ions
- Effective nuclear charge by Slater's rules
- Average atomic mass from isotope abundances
Group 18
Atomic weights are the IUPAC 2021 standard values, abridged to the conventional five significant figures. Group, period, category and electron configuration are derived from the atomic number rather than stored, so they cannot drift out of step with it.