Europium (Eu) — Atomic Data, Electron Shells & Reactions

Atomic Number (Z) 63 IUPAC Symbol Eu Standard Atomic Weight 151.96 g/mol Period / Group / Block 6 / f-block / f-block Condensed Electron Config [Xe] 4f7 6s2 Full Subshell Config 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f7 5s2 5p6 6s2 Principal Shell Occupancy [2, 8, 18, 25, 8, 2] Pauling Electronegativity 1.2 First Ionization Energy 547 kJ/mol Covalent Radius 198 pm Melting Point 1099 K (825.85 °C) Boiling Point 1802 K (1528.85 °C) Density 5.243 g/cm³ Oxidation States +3, +2