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argon [Ar]
From the Greek: argon meaning inactive. Discovered in 1894 by William Ramsay & Lord Raleigh
Occurrence:
1) found in the air & in volcanic gases
2) obtained from fractional distillation of liquid air
Characteristics:
-> colorless odorless inert gaseous element
Uses:
-> filler for electric bulbs. (1890)
Related
periodic table
General
inert gas (noble gas, rare gas)
Properties
SIZE: AW = 39.948
atomic number
VALUE: 18
VALENCE: NE 3D10 3S2 3P6
References
- Webster's Ninth New Collegiate Dictionary, Miriam-
Webster Inc. Springfield, MA 1990
- Chemical & Engineering News, Sept 8, 2003