Argon

Description

An inert, colorless, odorless, gaseous element. Argon has an abundance of 0.935% in the earth's atmosphere. It was discovered in 1894 by Lord Rayleigh and Sir William Ramsay. Argon is inert but will form compounds with highly electronegative elements such as Oxygen and Fluorine. It is used as a filler in incandescent lightbulbs and neon-type bulbs where it produces a purple fluorescence. Argon is also used in some lasers.

Synonyms and Related Terms

Ar; argo (It.); argônio (Port. Brazil); árgon (Port.); argón (Esp.); Argon (Ces., Dan., Deut., Fr., It., Ned., Pol., Slov., Sven.)

Other Properties

Emits purple light when an electric current is passed through.

Composition	Ar (atomic no. 18)
CAS	7440-37-1
Melting Point	-189.3
Molecular Weight	atomic wt = 39.948
Boiling Point	-185.7

Hazards and Safety

Can act as an asphyxiant by displacing air.

International Chemical Safety Card

Additional Information

Web Elements: Website

Sources Checked for Data in Record

• Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976

• Chemical & Engineering News, American Chemical Society, Washington DC, 81 (36) , Sept. 8, 2003

• Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993

• The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983

• Wikipedia, the free encyclopedia, at http://www.wikipedia.com Comment: http://en.wikipedia.org/wiki/Argon (Accessed Mar. 20, 2006) -for non-English terms

• G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971

• Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997

• The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998

• Art and Architecture Thesaurus Online, http://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000