Science Periodic Table - Elements - Plutonium Symbol Pu Atomic Number 94 Relative Atomic Mass 12C = 12.0000 244.0642 (244Pu) Atomic Radius pm n/a First Ionisation Energy kJ mol-1 585 Electronegativity 1.28 Density kg m-3 19840 (α) [298 K] 16623 [l., m.p.] Molar Volume cm3 12.3 Thermal Conductivity W m-1 K-1 6.74 [300 K] Melting Point K 914 Boiling Point K 3505 Number of Isotopes 15 Ground State Electron Configuration [Rn]5f67s2 Term Symbol 7F0 Discovery Discovered by G.T. Seabord, J.W. Kennedy and A.C. Wahl (Berkeley, USA) in 1940 Name Derived From Named after the planet Pluto Name in Other Languages  Croatian Plutonij  Danish plutonium  Dutch plutonium  Finnish plutonium  French plutonium  German Plutonium  Italian plutonio  Norwegian plutonium  Portuguese plutónio  Spanish plutonio  Swedish plutonium Peter van der Krogt's Element Multidict - element name translations in over 48 langauges

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