Atomic number: 54

Symbol: Xe

Category: noble gas

Density at 25°C: gas

This is the last of the atomically stable noble gases. like the other noble gases it is very stable but not quite as stable. Xenon can be forced to form compounds but usually with very reactive elements like fluorine.  Probably because it is large atom it has been found to have an effect on biological systems, especially for use as an anaesthetic.

Xenon gas discharge tube. image: adapted from wikipedia

Use, natural applications or common combinations: 

  • lighting. lasers
  • anaesthetics
  • radioactive isotopes for medical imaging.

Basic characteristics:

  • Standard atomic weight: 131.293(6)
  • Melting point:  -111.7 °C
  • Boiling point: -108.12 °C
  • Radioactivity: mostly naturally stable
  • some isotopes (133Xe) are used for medical imaging, some trace amounts used for dating meteorites.