Physics & Chemistry


October 17, 2011, 1:16 pm

Previous Element: Iodine

Next Element: Cesium


Physical Properties
Color colorless
Phase at Room Temp. gas
Density (g/cm3) 0.0059
Hardness (Mohs) ---
Melting Point (K) 161.3
Boiling Point (K) 165
Heat of Fusion (kJ/mol) 3.1
Heat of Vaporization (kJ/mol) 12.7
Heat of Atomization (kJ/mol) 0
Thermal Conductivity (J/m sec K) 0.01
Electrical Conductivity (1/mohm cm) 0
Source air
Atomic Properties
Electron Configuration [Kr]4d105s25p6
Number of Isotopes 9
Electron Affinity (kJ/mol) ---
First Ionization Energy (kJ/mol) 1170.4
Second Ionization Energy (kJ/mol) 2046.4
Third Ionization Energy (kJ/mol) 3097.2
Electronegativity 2.6
Polarizability (Å3) 4
Atomic Weight 131.29
Atomic Volume (cm3/mol) 37.3
Ionic Radius2- (pm) ---
Ionic Radius1- (pm) ---
Atomic Radius (pm) 131
Ionic Radius1+ (pm) ---
Ionic Radius2+ (pm) ---
Ionic Radius3+ (pm) ---
Common Oxidation Numbers +2,+4,+6
Other Oxid. Numbers +8
In Earth's Crust (mg/kg) 3×10-5
In Earth's Ocean (mg/L) 5×10-5
In Human Body (%) 0%
Regulatory / Health
CAS Number 7440-63-3
OSHA Permissible Exposure Limit (PEL) No limits
OSHA PEL Vacated 1989 No limits
NIOSH Recommended Exposure Limit (REL) No limits
Mineral Information Institute
Jefferson Accelerator Laboratory

Xenon is the chemical element with atomic number 54. At normal atmospheric conditons xenon is a colorless gas; its density is much heavier than air, and it is a Noble gas, and, thus, essentially unreactive. Xenon is present in the Earth's atmosphere in trace quantities. The chemical symbol for xenon is Xe.



Institute, M. (2011). Xenon. Retrieved from


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