Template:Infobox xenon

Xenon,  ₅₄Xe

A xenon-filled discharge tube glowing light blue
Spectral lines of xenon
General properties
Name, symbol	xenon, Xe
Appearance	colorless gas, exhibiting a blue glow when placed in a high voltage electric field
Pronunciation	/ˈzɛnɒn/ or /ˈziːnɒn/ ZEN-on or ZEE-non
Xenon in the periodic table
Kr ↑ Xe ↓ Rn iodine ← xenon → caesium
Atomic number (Z)	54
Group, block	group 18 (noble gases), p-block
Period	period 5
Element category	noble gas
Standard atomic weight (±) (Ar)	131.293(6)
Electron configuration	[Kr] 4d10 5s2 5p6
per shell	2, 8, 18, 18, 8
Physical properties
Phase	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 (0 °C and 101.325 kPa)	5.894 g/L
when liquid, at b.p.	2.942 g/cm3
Triple point	161.405 K, ​81.77 kPa
Critical point	289.733 K, 5.842 MPa
Heat of fusion	2.27 kJ/mol
Heat of vaporization	12.64 kJ/mol
Molar heat capacity	21.01 J/(mol·K)
vapor pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 83 92 103 117 137 165
Atomic properties
Oxidation states	0, +1, +2, +4, +6, +8 ​(rarely more than 0; a weakly acidic oxide)
Electronegativity	Pauling scale: 2.6
Ionization 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
Miscellanea
Crystal structure	​face-centered cubic (fcc)
Speed of sound	gas: 169 m·s−1 liquid: 1090 m/s
Thermal conductivity	5.65×10−3 W/(m·K)
Magnetic ordering	diamagnetic
CAS Number	7440-63-3
History
Discovery and first isolation	William Ramsay and Morris Travers (1898)
Most stable isotopes of xenon
iso NA half-life DM DE (MeV) DP 124Xe 0.095% >4.8×1016 y (β+β+) 0.825 124Te 125Xe syn 16.9 h ε 1.652 125I 126Xe 0.089% – (β+β+) 0.8973 126Te 127Xe syn 36.345 d ε 0.662 127I 128Xe 1.91% – (SF) <35.047 129Xe 26.4% – (SF) <33.947 130Xe 4.07% – (SF) <32.483 131Xe 21.2% – (SF) <31.140 132Xe 26.9% – (SF) <30.885 133Xe syn 5.247 d β− 0.427 133Cs 134Xe 10.4% >1.1×1016 y (β−β−) 0.819 134Ba 135Xe syn 9.14 h β− 1.16 135Cs 136Xe 8.86% 2.165×1021 y β−β− 2.45783 136Ba
Decay modes in parentheses are predicted, but have not yet been observed

References

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