Stable isotope Xenon (Xe)

 
Isotope Z(p) N(n) Atomic Mass Natural Abundance Enrichment Level Chemical Form
Xe-124 54 70 123.905895 0.10% 99.90% Gas
Xe-126 54 72 125.904268 0.09% 99.90% Gas
Xe-128 54 74 127.903531 1.91% 99.90% Gas
Xe-129 54 75 128.9047780 26.40% 99.90% Gas
Xe-130 54 76 129.903509 4.10% 99.90% Gas
Xe-131 54 77 130.905083 21.20% 99.90% Gas
Xe-132 54 78 131.904155 26.90% 99.90% Gas
Xe-134 54 80 133.905395 10.40% 99.90% Gas
Xe-136 54 82 135.90722 8.90% 99.90% Gas

Properties of Xenon

Name Xenon
Symbol Xe
Atomic number 54
Atomic weight 131.29
Standard state Gas at 298 ºK
CAS Registry ID 7440-63-3
Group in periodic table 18
Group name Noble gas
Period in periodic table 5
Block in periodic table p-block
Color Colorless
Classification Nonmetallic
Freezing point -111.75 ºC
Liquefication point -108.4 ºC
Melting point -111.7 °C
Boiling point -108 °C
Thermal conductivity 0.00565 (gas) W/(m·K)
Electronegativity 2.6
Heat of vaporization 12.64 kJ·mol-1
Heat of fusion 2.30 kJ·mol-1
Density of gas 0.0059 g/cm3
Density of liquid 3.06 g/cm3 at -108 °C
Electron configuration [Kr]4d105s25p6
Atomic radius 1.31 Å
Oxidation state Usually 0, but known to form compounds with fluorine and oxygen
Critical pressure 57.64 atm
Critical temperature 16.06 ºC
Critical volume 118 cm3/mol