Lutetium (Lu) — Atomic Data, Electron Shells & Reactions

Atomic Number (Z) 71 IUPAC Symbol Lu Standard Atomic Weight 174.97 g/mol Period / Group / Block 6 / f-block / f-block Condensed Electron Config [Xe] 4f14 5d1 6s2 Full Subshell Config 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d1 6s2 Principal Shell Occupancy [2, 8, 18, 32, 9, 2] Pauling Electronegativity 1.27 First Ionization Energy 524 kJ/mol Covalent Radius 187 pm Melting Point 1925 K (1651.85 °C) Boiling Point 3675 K (3401.85 °C) Density 9.84 g/cm³ Oxidation States +3