|Atomic mass||39.9 amu|
|Date of discovery||1894|
|Name of discoverer||Sir William Ramsey|
|Name origin||From the Greek argon.|
Argon (Ar) is the most common of the noble gases. It is an inert component which comprises 0.934% of the Earth's atmosphere. It is a common shielding agent in welding or melting of metal, preventing reaction and subsequent oxidation of the hot metal with atmospheric air.
- The New American Desk Encyclopedia, Penguin Group, 1989