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From GAWDAwikiArgon is a colorless and odorless monatomic gas with a density relative to air of 1.38. Its chemical symbol is Ar. Argon's most useful property is its total inertness to all substances at all temperatures and pressures. It is most widely used as shielding gas in arc welding, where it can be used alone or in a shielding gas mix.
See also: Liquid Argon
Argon was discovered in 1894 by Lord Raleigh and Sir William Ramsay. The element, which makes up 1% of the earth's atmosphere, is the third noble gas located in period 8.
- Molecular formula: Ar
- Atomic number: 18
- Atomic weight: 39.948
- Melting point: -189 °C
- Boiling point: -185.7 °C
- Density: 1.78.10 -3 g.cm -3 at 0 °C
- Phase at room temperature: Gas
- Element classification: Non-metal
- Period number: 3
- Group number: 18
- Group name: Noble gas
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