Argon
Argon
Argon (pronounced: /ˈɑːrɡɒn/ AR-gon) is a chemical element with the symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas.
Etymology
The name "Argon" is derived from the Greek word "Argos" meaning "lazy" or "inactive". This is in reference to the fact that the gas is almost completely chemically inert.
Properties
Argon is the third-most abundant gas in the Earth's atmosphere, at 0.934% (9340 ppmv). It is more than twice as abundant as water vapor (which averages about 4000 ppmv, but varies greatly), 23 times as abundant as carbon dioxide (400 ppmv), and more than 500 times as abundant as neon (18 ppmv). Argon is the most abundant noble gas in Earth's crust, comprising 0.00015% of the crust.
Uses
Argon has several uses in industries such as welding and lighting. In welding, it is used as a shielding gas to protect the weld area from atmospheric gases. In lighting, it is used in fluorescent tubes and low-energy light bulbs.
Related Terms
External links
- Medical encyclopedia article on Argon
- Wikipedia's article - Argon
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