Xenon
Element 54 · Noble gas
Specimen
- Atomic number
- 54
- Atomic mass
- 131.29
- State at room temperature
- Gas
- Melting point
- -111.8 °C
- Boiling point
- -108.1 °C
- Density
- 0.005887 g/cm³
- Discovered
- 1898
Can I eat it?
- In food and water
- Not needed, little harm known. Xenon is a gas with no known function in the body. The RSC says xenon itself is not toxic. Its compounds are highly toxic because they are strong oxidizers. 3
The atom
| Shell | Electrons |
|---|---|
| 1 (K) | 2 |
| 2 (L) | 8 |
| 3 (M) | 18 |
| 4 (N) | 18 |
| 5 (O) outermost | 8 |
| Total | 54 |
Configuration [Kr] 4d¹⁰ 5s² 5p⁶
4d ↑ ↓ ↑ ↓ ↑ ↓ ↑ ↓ ↑ ↓
5s ↑ ↓
5p ↑ ↓ ↑ ↓ ↑ ↓
| Protons | 54 |
|---|---|
| Neutrons | 78 |
| Mass number | 132 |
Related elements
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Sources
- 1
IUPAC Commission on Isotopic Abundances and Atomic Weights (CIAAW), 2024. Abridged Standard Atomic Weights 2024 .
The atomic mass shown for the 84 elements that have a standard atomic weight.
- 2
National Center for Biotechnology Information (PubChem), 2026. Periodic Table of Elements .
Electron configuration, melting and boiling points, density and discovery year for all 118 elements.
- 3
Royal Society of Chemistry, 2026. Xenon - Element information, properties and uses .
-
Xenon has no known biological role. It is not itself toxic, but its compounds are highly toxic because they are strong oxidising agents.
-
- 4
National Institute of Standards and Technology (NIST), 2026. Atomic Weights and Isotopic Compositions for All Elements .
Isotopic composition of each element; the most abundant isotope sets the neutron count in the nucleus view.