Xenon

It is a colourless, hivy, odorless noble gas, that occurs in the Yird's atmosphere in trace amoonts. Altho generally unreactive, xenon can unnergo a few chemical reactions sic as the furmation o xenon hexafluoroplatinate, the first noble gas compound tae be synthesized.

Xenon, ₅₄Xe

A xenon-filled dischairge tube glowin licht blue
Xenon
Pronunciation	/ˈzɛnɒn/ (ZEN-on) /ˈziːnɒn/ (ZEE-non)
Appearance	colourless gas, exhibitin a blue glow when placed in a heich voltage electric field
Standard atomic weight Ar, std(Xe)	7002131293000000000♠131.293(6)
Xenon in the periodic cairt
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gowd Mercur (element) Thallium Leid (element) Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium Kr ↑ Xe ↓ Rn iodine ← xenon → caesium
Atomic nummer (Z)	54
Group	group 18 (noble gases)
Period	period 5
Block	p-block
Element category	Noble gas
Electron confeeguration	[Kr] 4d10 5s2 5p6
Electrons per shell	2, 8, 18, 18, 8
Pheesical properties
Phase at STP	gas
Meltin pynt	161.40 K ​(-111.75 °C, ​-169.15 °F)
Bylin pynt	165.051 K ​(-108.099 °C, ​-162.578 °F)
Density (at STP)	5.894 g/L
whan liquid (at b.p.)	3.057 g/cm3
Treeple pynt	161.405 K, ​81.77 kPa
Creetical pynt	289.733 K, 5.842 MPa
Heat o fusion	2.27 kJ/mol
Heat o vapourisation	12.64 kJ/mol
Molar heat capacity	5R/2 = 20.786 J/(mol·K)
Vapour pressur 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 non-0, waikly acidic
Electronegativity	Pauling scale: 2.6
Covalent radius	140±9 pm
Van der Waals radius	216 pm
Spectral lines o xenon
Ither properties
Naitural occurrence	primordial
Creestal structur	​face-centred cubic (fcc)
Speed o soond	(liquid) 1090 m/s; (gas) 169 m/s
Thermal conductivity	5.65×10-3  W/(m·K)
Magnetic orderin	diamagnetic
CAS Nummer	7440-63-3
History
Diskivery	William Ramsay an Morris Travers (1898)
First isolation	William Ramsay an Morris Travers (1898)
Main isotopes o xenon
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct 124Xe 0.095% >4.8×1016 y (β+β+) 124Te 125Xe syn 16.9 h ε 125I 126Xe 0.089% - (β+β+) 126Te 127Xe syn 36.345 d ε 127I 128Xe 1.91% - (SF) 129Xe 26.4% - (SF) 130Xe 4.07% - (SF) 131Xe 21.2% - (SF) 132Xe 26.9% - (SF) 133Xe syn 5.247 d β− 133Cs 134Xe 10.4% >1.1×1016 y (β−β−) 134Ba 135Xe syn 9.14 h β− 135Cs 136Xe 8.86% 2.11×1021 y β−β− 136Ba
Decay modes in parentheses are predictit, but hae nae yet been observed
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Xenon is uised in flash lamps an arc lamps, an as a general anesthetic. The first excimer laser design uised a xenon dimer molecule (Xe₂) as the lasin medium, an the earliest laser designs uised xenon flash lamps as pumps. Xenon is uised tae sairch for hypothetical waikly interactin massive pairticles an as the propellant for ion thrusters in spacecraft. an for the three ion propulsion engines on NASA's Dawn Spacecraft.

Naiturally occurrin xenon consists o aicht stable isotopes. Mair nor 40 unstable xenon isotopes unnergae radioactive decay, an the isotope ratios o xenon are an important tuil for studyin the early history o the Solar Seestem. Radioactive xenon-135 is produced bi beta decay frae iodine-135 (a product o nuclear fission), an is the maist signeeficant (an unwantit) neutron absorber in nuclear reactors.