Symbol Xe
Atomic Number 54
Atomic Mass 131.293 g.mol 1
Discovered by William Ramsay in the year 1898

Chemical Properties of Xenon

Group 18 Melting point −111.75°C/ −169.15°F/ 161.4 K
Period 5 Boiling point −108.099°C, −162.578°F, 165.051 K
Block p Density (g cm3) 0.005366
Atomic number 54 Relative atomic mass 131.293
State at 20°C Gas Key isotopes 132Xe
Electron configuration [Kr] 4d105s25p6 CAS number 7440-63-3
ChemSpider ID 22427 ChemSpider is a free chemical structure database

What is Xenon?

  • Xenon is a chemical element with symbol Xe and atomic number 54 in the periodic table.
  • It was discovered by William Ramsay in the year 1898.

Physical properties of Xenon

  • Xenon is a rare, colorless, odorless, tasteless and chemically unreactive gas.
  • Xenon is a trace gas ( i.e., which makes up less than 1 % by volume of Earth’s atmosphere. It is found as a component in gases released from few mineral springs.
  • It is also released as a by-product when the air is separated into Nitrogen and Oxygen.
  • The element has an atomic number 54 as its nucleus contains 54 protons. It is available in all forms i.e., solids, liquids, and gases.

Applications and effects of Xenon

Optics and illumination

  • It is used in Flash lamps called Xenon flash lamps.
  • It is also used in Stroboscopic lamps and photographic flashes.
  • Lasers are generated with the help of Xe gas.


  • The element Xe acts as a natural anesthetic.
  • Inhaling the mixture of oxygen and xenon produces a hormone which helps to increase Red Blood Cell (RBC) production.
  • It is used to measure the flow of blood and also used to image the Brain, Heart, and Lungs.
  • Also, the element is used in NMR spectroscopy

Interesting Facts of Xenon

  • The name Xenon is derived from a Greek word Xenos which means “stranger”.
  • It is most expensive and most dense of all the gases.
  • It produces a bluish purple color when electrified.
  • It forms very good compounds with Fluorine.

Practise This Question

DIRECTIONS: Each of these questions contains an Assertion followed by Reason. Read them carefully and answer the question on the basis of following options. You have to select the one that best describes the two statements.

Assertion: Isotopes are electrically neutral
Reason: Isotopes are species with same mass number but different atomic number