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Name Argon
Symbol Ar
Atomic number 18
Atomic mass 39.9 amu
Classification Non-metal
Crystal structure Cubic
Color Colorless gas
Date of discovery 1894
Name of discoverer Sir William Ramsey
Name origin From the Greek argon.
Uses Lighting
Obtained from Air

Argon (Ar) is the most common of the noble gases. It is an inert component which comprises 0.934% of the Earth's atmosphere.[1] It is a common shielding agent in welding or melting of metal, preventing reaction and subsequent oxidation of the hot metal with atmospheric air.


  1. The New American Desk Encyclopedia, Penguin Group, 1989