Atomic Number
63
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.
63
151.96 u
lanthanide
solid
5.24 g/cm³
2, 8, 18, 25, 8, 2
Protons: 63 • Electrons: 63 • Neutrons: Varies by isotope
Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f⁷
1901 • Eugène-Anatole Demarçay