Curium (Cm) — Atomic Data, Electron Shells & Reactions

Atomic Number (Z) 96 IUPAC Symbol Cm Standard Atomic Weight 247 g/mol Period / Group / Block 7 / f-block / f-block Condensed Electron Config [Rn] 5f7 6d1 7s2 Full Subshell Config 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f7 6s2 6p6 6d1 7s2 Principal Shell Occupancy [2, 8, 18, 32, 25, 9, 2] Pauling Electronegativity 1.28 First Ionization Energy 581 kJ/mol Covalent Radius 169 pm Melting Point 1613 K (1339.85 °C) Boiling Point 3383 K (3109.85 °C) Density 13.51 g/cm³ Oxidation States +3