Oxygen (O) properties

Atomic mass, symbol and atomic number

oxygen is a naturally occurring element with the element symbol O and the atomic number 8. In the periodic table it stands with an atomic mass of 15,999 u in the 6th main group. The chemical element discovered by Wilhelm Scheele in 1771 is not radioactive and is in a gaseous state at room temperature.

Characteristics: Oxygen

Chemical element:oxygen
Atomic number:8
explorers:Wilhelm Scheele
Year of discovery:1771
Atomic properties
Atomic mass:15,999 u
Atomic radius:60 pm
Covalent radius:66 pm
Van der Waals radius:152 pm
Electron configuration:1s2 2s2 2p4
ionization:1313.9 kJ / mol
Physical Properties
Physical state:gaseous
Crystal structure:cubic
molar volume:17,36 · 10-6 m3/ mol
Mohs hardness:/
Melting point:-218 ° C
Boiling point:-183 ° C
Heat of fusion:0.22 kJ / mol
Heat of vaporization:5.58 kJ / mol
Thermal conductivity:0.026 W
Chemical properties

Did you know that ...

  • Almost 50% oxygen is the most common element of the earth's crust?
  • Oxygen after helium and hydrogen is the third most abundant element in the universe, and still does not make up 1%?
  • the molecules of the ocean layer are each made up of three oxygen atoms (O3) consist?
  • Oxygen on Earth almost exclusively as molecular oxygen (O2) occurs?
  • the chemists Carl Wilhelm Scheele and Joseph Priestley discovered oxygen independently in 1771 and 1774, respectively?
  • the oxygen in the earth's atmosphere was created almost exclusively by the photosynthesis of plants and algae?