Science Periodic Table - Elements - Xenon Symbol Xe Atomic Number 54 Relative Atomic Mass 12C = 12.0000 131.29 Atomic Radius pm 218 First Ionisation Energy kJ mol-1 1170.4 Electronegativity 2.6 Density kg m-3 3540 [s., m.p.] 2939 [l., b.p.] 5.8971 [g., 273 K] Molar Volume cm3 37.09 [161 K] Thermal Conductivity W m-1 K-1 0.00569 [300 K] Melting Point K 161.3 Boiling Point K 166.1 Number of Isotopes 35 Ground State Electron Configuration [Kr]4d105s25p6 = [Xe] Term Symbol 1S0 Discovery Discovered by Sir W. Ramsay and M.W. Travers (London, England) in 1898 Name Derived From Greek xenos meaning 'stranger' Name in Other Languages  Croatian Ksenon  Danish xenon  Dutch xenon  Finnish ksenon  French xénon  German Xenon  Italian xeno  Norwegian xenon  Portuguese xénon  Spanish xenón  Swedish xenon Peter van der Krogt's Element Multidict - element name translations in over 48 langauges

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