18

Ar

Argon
39.948
 Historical Information

Argon was discovered by Lord Rayleigh and Sir William Ramsay in 1894. It was isolated by examination of the residue obtained by removing nitrogen, oxygen, carbon dioxide, and water from clean air. In fact, air contains less than 1% argon. The atmosphere of Mars contains less than 2% argon.
Basic Information Shells
  • Name:Argon
  • Symbol: Ar
  • Atomic number: 18
  • Atomic weight:39.948
  • Standard state: gas at 298 K
  • Group in periodic table: 18
  • Group name:Noble gas
  • Period in periodic table: 3
  • Block in periodic table: p-block
  • Classification: Non-metallic
 argon
Uses Trivia
  • used as an inert gas shield for arc welding and cutting
  • blanket for the production of titanium and other reactive elements

Argon is a colourless and odourless gas present to a very small extent in the atmosphere. Argon is very inert (indeed it is referred to as one of the noble gases) and is not known to form true chemical compounds.