Argon

For light bulbs

Atomic Number: 18
Atomic Symbol: Ar
Atomic Weight: 39.948
Electron Configuration: [Ne]3s23p6

 

History

(Gr. argos, inactive) Its presence in air was suspected by Cavendish in 1785, discovered by Lord Rayleigh and Sir William Ramsay in 1894.

Sources

The gas is prepared by fractionation of liquid air because the atmosphere contains 0.94% argon. The atmosphere of Mars contains 1.6% of 40Ar and 5 p.p.m. of 36Ar.

Properties

Argon is two and one half times as soluble in water as nitrogen, having about the same solubility as oxygen. Argon is colorless and odorless, both as a gas and liquid. Argon is considered to be a very inert gas and is not known to form true chemical compounds, as do krypton, xenon, and radon.

Isotopes

Naturally occurring argon is a mixture of three isotopes. Twelve other radioactive isotopes are known to exist.

Uses

It is used in electric light bulbs and in fluorescent tubes at a pressure of about 400 Pa. and in filling photo tubes, glow tubes, etc. Argon is also used as an inert gas shield for arc welding and cutting, as blanket for the production of titanium and other reactive elements, and as a protective atmosphere for growing silicon and germanium crystals.

Sources: CRC Handbook of Chemistry and Physics and the American Chemical Society.

Last Updated: 12/19/97, CST Information Services Team





Contact Us

If you have questions or need our depth of experience to help with your issues...

Call us: 281-556-8774

Email us: info@hghouston.com

News

The safe operation of oil refineries in the United States is under constant r...read more
When: January 30, 2017 - February 2, 2017 Where: Galveston Island Conventi...read more

View all articles

Stay Current

Sign up for our quarterly newsletter

covering updates on corrosion