Nobelium (No) — Atomic Data, Electron Shells & Reactions

Atomic Number (Z) 102 IUPAC Symbol No Standard Atomic Weight 259 g/mol Period / Group / Block 7 / f-block / f-block Condensed Electron Config [Rn] 5f14 7s2 Full Subshell Config 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 7s2 Principal Shell Occupancy [2, 8, 18, 32, 32, 8, 2] Pauling Electronegativity 1.3 First Ionization Energy 642 kJ/mol Covalent Radius 176 pm Melting Point 1100 K (826.85 °C) Boiling Point — Density 9.9 g/cm³ Oxidation States +2, +3