Atomic Number: 18
Atomic Symbol: Ar
Atomic Weight: 39.948
Boiling Point: -185.85 C
Melting Point: -189.35 C

Argon gas is used to fill lightbulbs and was discovered in 1894. It is 2 1/2 times more soluble in water as nitrogen and the only time argon occurs naturally in nature is when there is a mixture of three isotopes. Argon is used to fill glow tubes and other florescent or glowing man-made items. It can be used as a gas shield for arc welding and as a blanket for the production of elements that are reactive and can be even used, because it can form the correct atmosphere, to grow silicon crystals. Our atmosphere contains about 0.9% argon.

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