Xenon, 54 Xe General properties Pronunciation Template:Infobox element/pronunciation Appearance colorless gas, exhibiting a blue glow when placed in an electric field Standard atomic weight (A r, standard ) Template:Infobox element/standard atomic weight Mass number Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope)Xenon in the periodic table Template:Infobox element/periodic table Atomic number (Z ) 54 Group Template:Infobox element/group Period period 5 Block p-block Element category Template:Infobox element/category format Electron configuration [Kr ] 4d10 5s2 5p6 Electrons per shell
2, 8, 18, 18, 8 Physical properties Phase at STP gas Melting point 161.40 K (−111.75 °C, −169.15 °F) Boiling point 165.051 K (−108.099 °C, −162.578 °F) Density (at STP) 5.894 g/L when liquid (at b.p. ) 2.942 g/cm3 [1] Triple point 161.405 K, 81.77 kPa[2] Critical point 289.733 K, 5.842 MPa[2] Heat of fusion 2.27 kJ/mol [[Enthalpy of vaporization|Heat of Template:Engvar ]] 12.64 kJ/mol Molar heat capacity 21.01[3] J/(mol·K) [[Vapor pressure|Template:Engvar pressure ]] Atomic properties Oxidation states Template:Infobox element/symbol-to-oxidation-state Electronegativity Pauling scale: 2.6 [[Ionization energy|Template:Engvar energies]] 1st: 1170.4 kJ/mol 2nd: 2046.4 kJ/mol 3rd: 3099.4 kJ/mol Covalent radius 140±9 pm Van der Waals radius 216 pm Template:Infobox element/spectral lines Other properties Crystal structure Template:Infobox element/crystal structure Speed of sound gas: 178 m·s−1 liquid: 1090 m/s Thermal conductivity 5.65×10−3 W/(m·K) Magnetic ordering diamagnetic [4] Magnetic susceptibility −43.9·10−6 cm3 /mol (298 K)[5] CAS Number 7440-63-3 History Discovery and first isolationWilliam Ramsay and Morris Travers (1898)Main isotopes of xenon Template:Infobox element/isotopes table | references
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