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< Back Plutonium  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 94 Atomic Symbol Pu Atomic Weight [244 amu] Group Rare Earth (Actinide Series) Form Solid Density @ STP 19.7 g/cm3 Melting Point 640 °C (1184 °F, 913.15 °K) Boiling Point 3228 °C (5842.4 °F, 3501.15 °K) Heat of Fusion 2.82 kJ/mol Heat of Vaporization 325 kJ/mol First Ionization Potential 6.06 eV Electronegativity (on Pauling scale) 1.3 Ground State Electron Configuration 5f6 6s2 6p6 6f2 Oxidation States +3, +4, +5, +6 Selected Radioisotopes 238Pu, 239Pu, 241Pu, 244Pu Crystal Structure Monoclinic Discovered by Seaborg; McMillan; Kennedy; Wahl, 1940

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