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< Back Xenon  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 54 Atomic Symbol Xe Atomic Weight 131.29 amu Group Noble Gas, 18 Form Gas Density @ STP 5.761 g/L Melting Point -111.75 °C (-169.15 °F, 161.4 °K) Boiling Point -108.04 °C (-162.472 °F, 165.11 °K) Heat of Fusion 1.81 kJ/mol Heat of Vaporization 12.62 kJ/mol First Ionization Potential 12.12987 eV Electronegativity (on Pauling scale) 2.60 Specific Heat Capacity 0.158 J/g K Ground State Electron Configuration 5p6 Oxidation States 0 Stable Isotopes and Natural Abundance on Earth 124Xe, 0.10%; 126Xe, 0.09%; 128Xe, 1.91%; 129Xe, 26.4%; 130Xe, 4.1%; 131Xe, 21.2%; 132Xe, 26.9%; 134Xe, 10.4%; 136Xe, 8.9% Selected Radioisotopes 126Xe, 127Xe, 133Xe Atomic Radius 108 pm Crystal Structure Cubic Discovered by Ramsay; Travers, 1898

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