Xenon Electron Configuration

Reference for xenon's electron configuration (1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ or [Kr] 4d¹⁰ 5s² 5p⁶), orbital box diagram, quantum numbers, and its role as noble-gas core [Xe] for lanthanides and beyond.

Z = 54 Xe Xenon

Xenon — Electron Configuration

Atomic number 54 · Noble gas · Period 5, Group 18 · p-block

[Kr] 4d¹⁰ 5s² 5p⁶ 54 electrons 8 valence e⁻ Noble-gas core [Xe]

Subshell Breakdown

Subshell Type Electrons Max Capacity Notation
1s s orbital, shell n=1 2 2 1s²
2s s orbital, shell n=2 2 2 2s²
2p p orbitals, shell n=2 6 6 2p⁶
3s s orbital, shell n=3 2 2 3s²
3p p orbitals, shell n=3 6 6 3p⁶
3d d orbitals, shell n=3 10 10 3d¹⁰
4s s orbital, shell n=4 2 2 4s²
4p p orbitals, shell n=4 6 6 4p⁶
4d d orbitals, shell n=4 10 10 4d¹⁰
5s s orbital, shell n=5 2 2 5s²
5p p orbitals, shell n=5 (valence) 6 6 5p⁶
Total 54

Full Configuration

1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶

All 9 subshells written explicitly.

Noble-Gas Shorthand

[Kr] 4d¹⁰ 5s² 5p⁶

[Kr] = 1s² … 4p⁶ (krypton's filled 36-electron core).

Used as Core ([Xe])

[Xe] = 1s²…5p⁶

Shorthand for Cs, Ba, lanthanides, and actinides.

Shell Fill Summary

Shell 1 (n=1) — 1s² 2 / 2 electrons (100%)
Shell 2 (n=2) — 2s² 2p⁶ 8 / 8 electrons (100%)
Shell 3 (n=3) — 3s² 3p⁶ 3d¹⁰ 18 / 18 electrons (100%)
Shell 4 (n=4) — 4s² 4p⁶ 4d¹⁰ 18 / 32 electrons (56%)
Shell 5 (n=5) — 5s² 5p⁶ 8 / 50 electrons (16%)

Shell 4 can hold up to 32 electrons (4s + 4p + 4d + 4f). Xenon fills only 18 of those 32 slots — the 4f subshell is empty. Shell 5 can hold 50 electrons but xenon fills only 8 (5s + 5p). The next electrons (in cesium) jump to 6s.

Elements That Use [Xe] as Their Core

Element Z Configuration
Cesium (Cs) 55 [Xe] 6s¹
Barium (Ba) 56 [Xe] 6s²
Lanthanum (La) 57 [Xe] 5d¹ 6s²
Cerium (Ce) 58 [Xe] 4f¹ 5d¹ 6s²
Gadolinium (Gd) 64 [Xe] 4f⁷ 5d¹ 6s²
Gold (Au) 79 [Xe] 4f¹⁴ 5d¹⁰ 6s¹
Radon (Rn) 86 [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁶

Summary

Reference for xenon's electron configuration (1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ or [Kr] 4d¹⁰ 5s² 5p⁶), orbital box diagram, quantum numbers, and its role as noble-gas core [Xe] for lanthanides and beyond.

How it works

  1. The Aufbau principle fills subshells from lowest to highest energy: 1s → 2s → 2p → 3s → 3p → 4s → 3d → 4p → 5s → 4d → 5p.
  2. Xenon's 54 electrons completely fill nine subshells across five principal shells.
  3. The filled 5p subshell (6 electrons across three orbitals) is the outermost and closes xenon's valence shell.
  4. With no unpaired electrons and a complete outer shell, xenon has zero chemical valence under ordinary conditions.
  5. In noble-gas notation, [Xe] replaces the filled 54-electron core for all elements with Z ≥ 55.
  6. Use the tabs below to explore the configuration table, orbital diagram, and element properties.

Use cases

  • Quick reference for chemistry homework or exams on noble-gas and Period 5 configurations.
  • Understand why xenon forms a small number of stable fluoride compounds while still being classified as a noble gas.
  • Use [Xe] shorthand correctly when writing configurations for cesium through radon.
  • Visualize the fully paired 5p subshell that closes Period 5.
  • Compare xenon to argon ([Ar]) and krypton ([Kr]) as noble-gas cores.
  • Teaching aid for Aufbau principle, Hund's rule, and Pauli exclusion principle with a heavier element.
  • Reference quantum numbers for xenon's valence electrons in advanced chemistry courses.

Frequently Asked Questions

Last updated: 2026-07-08 · Reviewed by Nham Vu