---
title: "Xenon (Xe): Atomic Mass, Electron Configuration & Properties"
url: https://www.moldraw.com/elements/xenon.html
description: "Xenon (Xe), element 54: atomic mass 131.29, electron configuration [Kr] 4d¹⁰ 5s² 5p⁶, group 18, period 5, p-block noble gas. Melting and boiling point, density, electronegativity and shells."
lang: en
publisher: Scidart Academy
generated: 2026-11-03
---
54Xe131.29

# Xenon (Xe) – element 54

Xenon is a chemical element with the symbol **Xe** and atomic number **54**. It is a noble gas in group 18 (noble gases), period 5 of the periodic table (p-block), and is a gas at room temperature.

Xenon (Xe) has atomic number 54, atomic mass 131.29 u and electron configuration [Kr] 4d10 5s2 5p6.

[Download periodic table PDF](https://www.moldraw.com/printables/periodic-table.pdf)[Open interactive periodic table](https://www.moldraw.com/tools/free-chem-tools/interactive-periodic-table.html)

## Xenon facts

| Symbol | Xe |
| --- | --- |
| Atomic number | 54 |
| Atomic mass | 131.29 u (g/mol) |
| Category | noble gas |
| Group | group 18 (noble gases) |
| Period | 5 |
| Block | p-block |
| Phase at 20 °C | Gas |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 |
| Noble-gas notation | [Kr] 4d10 5s2 5p6 |
| Electrons per shell | 2, 8, 18, 18, 8 |
| Valence electrons | 8 |

## Bohr model and shells

Xenon has 54 electrons in 5 shells: 2, 8, 18, 18, 8. Full configuration and noble-gas notation are in the table; work out any element or ion with the [electron configuration calculator](https://www.moldraw.com/tools/free-chem-tools/electron-configuration-calculator.html).

## Physical and atomic properties

| Melting point | 161.4 K (-111.7 °C) |
| --- | --- |
| Boiling point | 165.051 K (-108.1 °C) |
| Density | 5.894 g/L |
| Electronegativity (Pauling) | 2.6 |
| Electron affinity | -77 kJ/mol |
| Ionization energies | 1170.4, 2046.4, 3099.4 kJ/mol (1st, 2nd, 3rd) |
| Discovered by | William Ramsay |

Use the atomic mass in the [molar mass calculator](https://www.moldraw.com/tools/free-chem-tools/molar-mass-calculator.html) for any formula containing Xe.

## Position in the periodic table

Tap any element to open its page.

## Frequently asked questions

### What is the atomic mass of xenon?

The atomic mass of xenon is 131.29 u, so one mole of xenon atoms weighs 131.29 g.

### What is the electron configuration of xenon?

Xenon has 54 electrons: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶, or [Kr] 4d¹⁰ 5s² 5p⁶ in noble-gas notation. Electrons per shell: 2, 8, 18, 18, 8.

### How many valence electrons does xenon have?

Xenon has 8 valence electrons (group 18).

### Is xenon a metal?

No. Xenon is a nonmetal (noble gas).

### Where is xenon on the periodic table?

Xenon is in group 18 (noble gases), period 5, in the p-block.

Data: [Periodic-Table-JSON](https://github.com/Bowserinator/Periodic-Table-JSON) (CC BY-SA 3.0); standard atomic weights from IUPAC (abridged). Values in brackets are the mass number of the longest-lived isotope.