(From the
Greek argos, "inert") A colorless, odorless, tasteless
chemical element, the most abundant of the
noble gases, constituting nearly 1% of the
atmosphere. It is used in
incandescent light bulbs,
radio tubes,
welding, etc.
Symbol: Ar
Atomic number: 18
Atomic weight: 39.948
Density (at 0°C with 101,325 pascals): 1.78 g/L
Melting point: -189°C
Boiling point: -185.9°C
Valence: 0
Ground state electron configuration: [Ne]3s23p6