Science Periodic Table - Elements - Selenium Symbol Se Atomic Number 34 Relative Atomic Mass 12C = 12.0000 78.96 Atomic Radius pm 215 First Ionisation Energy kJ mol-1 940.9 Electronegativity 2.55 Density kg m-3 4790 (grey) [293 K] 3987 [l., m.p.] Molar Volume cm3 16.48 Thermal Conductivity W m-1 K-1 2.04 [300 K] Melting Point K 490 Boiling Point K 958.1 Number of Isotopes 26 Ground State Electron Configuration [Ar]3d104s24p4 Term Symbol 4P2 Discovery Discovered by J.J. Berzelius (Stockholm, Sweden) in 1817 Name Derived From Greek selene meaning 'moon' Name in Other Languages  Croatian Selenij  Danish selen  Dutch seleen  Finnish seleeni  French sélénium  German Selen  Italian selenio  Norwegian selen  Portuguese selénio  Spanish selenio  Swedish selen Peter van der Krogt's Element Multidict - element name translations in over 48 langauges

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