Symbol O
Atomic Number 8
Atomic Mass 15.999 g.mol-1
Discovered by Joseph Priestly in 1774

Table of Contents

Chemical Properties of Oxygen

Group 16 Melting point -219 °c
Period 2 Boiling point -183 °c
Block p Density (g cm−3) 0.001308
Atomic number 8 Relative atomic mass 15.999
State at 20°C Gas Key isotopes 16O
Electron configuration [He]2s2 2p4 CAS number 7782-44-7
ChemSpider ID 140526 ChemSpider is a free chemical structure database

What is Oxygen?

  • Oxygen is a member of the chalcogen group on the periodic table. It is an essential element in most combustion processes.
  • It is one of the most abundant elements in the Earth’s crust.

Uses of Oxygen

  • It is used in the production and manufacturing of glass and stone products, and in mining.
  • Special oxygen chambers are used in case of high pressure to increase the partial pressure of oxygen around the patient.
  • The primary applications of oxygen include melting, refining, and manufacturing of steel along with other metals.

Physical Properties of Oxygen

  • The gas is colourless, odourless and insipid in a normal state. Liquid oxygen is slightly paramagnetic. It is reactive and forms oxides with every element except helium, neon, krypton, and argon. It is moderately soluble in water.
  • Dioxygen is one of the common allotropes of oxygen.
  • Trioxygen is the most reactive allotrope of oxygen that would cause damage to lung tissue. This allotrope is termed ozone.

Other Important Information

  • O-16, O-17, and O-18 are the three naturally occurring stable isotopes of Oxygen.
  • Oxygen is characterised by a paramagnetic property.

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