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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 State(s)	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