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.
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.
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 for any formula containing Eu.
Position in the periodic table
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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 (CC BY-SA 3.0); standard atomic weights from IUPAC (abridged). Values in brackets are the mass number of the longest-lived isotope.