Xe
Noble gas
Xenon
Z 54A 131mass 131.29
Atomic model
tap a particleEvery nucleon is drawn individually — 54 protons and 77 neutrons packed into the nucleus, with 54 electrons on shells outside.
54+1
Protons
Set the element — change this and it becomes a different atom.
770
Neutrons
Change only these and you get a different isotope of the same element.
54−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 131 (54 p + 77 n)
- Electron shells
- 2 · 8 · 18 · 18 · 8
- Valence shell
- 8 electrons
- Atomic mass
- 131.29 u
Stability
Xenon has no measured radioactive isotope in this lab — its nuclei are stable, so decay must be shown as an illustration.
Open the decay lab