Chemical element · Atomic number 54
Xenon
Xenon in the periodic table: atomic number 54, electron configuration, atomic mass, physical data, oxidation states, media credit and visible sources.
Noble gas
gaseous
131.29 u
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Atomic classification
Shell occupancy
Xenon in the Bohr shell model
This shows the electron distribution of the neutral atom in a simplified shell model.
- K · n=1
- 2 electrons
- L · n=2
- 8 electrons
- M · n=3
- 18 electrons
- N · n=4
- 18 electrons
- O · n=5
- 8 electrons
- Electron configuration
- [Kr]5s2 4d10 5p6
- Electrons per shell
- 2 · 8 · 18 · 18 · 8
- Group
- 18
- Period
- 5
- Block
- P
- Element category
- Noble gas
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Physical and chemical properties
- Atomic mass
- 131.29 u
- Standard state
- gaseous
- Density
- 0.005887 g/cm³
- Melting point
- 161.36 K
- Boiling point
- 165.03 K
- Electronegativity
- 2.6 (Pauling)
- First ionisation energy
- 12.13 eV
- Oxidation states
- 0
- Discovery
- 1898
Safety and periodic classification
Safety
Safe handling cannot be inferred from Xenon's position in the periodic table alone. Laboratory, classroom and disposal decisions must follow the documentation for the exact material and its safety data sheet.
Position and comparison
Xenon is in period 5, group 18 and the P block. Its direct neighbours by atomic number are Iodine and Cesium. The recorded Pauling electronegativity is 2.6. Periodic trends are compared only through the separately sourced neighbouring values.
Sources and scope
PubChem attributes element data to sources including IUPAC, NIST and IAEA. Quanta stores the referenced snapshot locally and leaves unknown values unavailable.