Xenon (Xe)
Xenon is the chemical element with atomic number 54 and symbol Xe. It is a noble gas in period 5, group 18, with a standard atomic weight of 131.29 u.
Key facts
- Z
- 54
- Atomic weight
- 131.29 u
- Category
- noble gas
- State at 298 K
- Gas
- Occurrence
- primordial
- Discovered
- 1898
- CAS
- 7440-63-3
Measured properties
| Property | Value | Source |
|---|---|---|
| Electronegativity | 2.6 | National Center for Biotechnology Information (NIH) |
| Melting point | 161.36 K | National Center for Biotechnology Information (NIH) |
| Boiling point | 165.03 K | National Center for Biotechnology Information (NIH) |
| Density stp | 0.006 g/cm³ | National Center for Biotechnology Information (NIH) |
| Atomic radius empirical | 216 pm | National Center for Biotechnology Information (NIH) |
| Ionization energy 1st | 1,170.4 kJ/mol | National Center for Biotechnology Information (NIH) |
Electron configuration
- Noble gas notation
- [Kr] 4d¹⁰ 5s² 5p⁶
- Full notation
- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶
- Electrons per shell
- 2, 8, 18, 18, 8