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< Back Nobelium  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 102 Atomic Symbol No Atomic Weight [259 amu] Group Rare Earth (Actinide Series) Melting Point 827 °C (1520.6 °F, 1100.15 °K) First Ionization Potential 6.65 eV Ground State Electron Configuration 5f14 6s2 6p6 6f2 Oxidation States +2, +3 Selected Radioisotopes 252No, 254No, 257No Discovered by Ghiorso; Sikkeland; Walton; Seaborg, 1958

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