Europium (Eu)

Europium is a chemical element with symbol Eu and atomic number 63. It is a moderately hard, silvery metal which readily oxidizes in air and water.

Atomic Number

63

Atomic Mass

151.96 u

Category

lanthanide

Phase

solid

Density

5.24 g/cm³

Electron Shells

2, 8, 18, 25, 8, 2

Atomic Structure

Protons: 63 • Electrons: 63 • Neutrons: Varies by isotope

Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f⁷

Discovery

1901 • Eugène-Anatole Demarçay