---
title: "Europium (Eu): Atomic Mass, Electron Configuration & Properties"
url: https://www.moldraw.com/elements/europium.html
description: "Europium (Eu), element 63: atomic mass 151.96, electron configuration [Xe] 4f⁷ 6s², group 3, period 6, f-block lanthanide. Melting and boiling point, density, electronegativity and shells."
lang: en
publisher: Scidart Academy
generated: 2026-11-03
---
63Eu151.96

# Europium (Eu) – element 63

Europium is a chemical element with the symbol **Eu** and atomic number **63**. It is a lanthanide in group 3 (lanthanides), period 6 of the periodic table (f-block), and is a solid at room temperature.

Europium (Eu) has atomic number 63, atomic mass 151.96 u and electron configuration [Xe] 4f7 6s2.

[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)

## Europium facts

| Symbol | Eu |
| --- | --- |
| Atomic number | 63 |
| Atomic mass | 151.96 u (g/mol) |
| Category | lanthanide |
| Group | group 3 (lanthanides) |
| Period | 6 |
| Block | f-block |
| Phase at 20 °C | Solid |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f7 |
| Noble-gas notation | [Xe] 4f7 6s2 |
| Electrons per shell | 2, 8, 18, 25, 8, 2 |

## Bohr model and shells

Europium has 63 electrons in 6 shells: 2, 8, 18, 25, 8, 2. 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 | 1099 K (825.9 °C) |
| --- | --- |
| Boiling point | 1802 K (1528.8 °C) |
| Density | 5.264 g/cm³ |
| Electronegativity (Pauling) | 1.2 |
| Electron affinity | 11.2 kJ/mol |
| Ionization energies | 547.1, 1085, 2404 kJ/mol (1st, 2nd, 3rd) |
| Molar heat capacity | 27.66 J/(mol·K) |
| Discovered by | Eugène-Anatole Demarçay |

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 Eu.

## Position in the periodic table

Tap any element to open its page.

## Frequently asked questions

### What is the atomic mass of europium?

The atomic mass of europium is 151.96 u, so one mole of europium atoms weighs 151.96 g.

### What is the electron configuration of europium?

Europium has 63 electrons: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f⁷, or [Xe] 4f⁷ 6s² in noble-gas notation. Electrons per shell: 2, 8, 18, 25, 8, 2.

### Is europium a metal?

Yes. Europium is a lanthanide.

### Where is europium on the periodic table?

Europium is in group 3 (lanthanides), period 6, in the f-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.