argon
Sign in to saveArgon is a chemical element; it has symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas. Argon is the third most abundant gas in 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.
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Argon is a chemical element and noble gas that makes up about 0.934% of Earth's atmosphere, making it the third most abundant gas in the air we breathe. It is notably more plentiful than other gases like carbon dioxide and water vapor, and is the most abundant noble gas found in Earth's crust.
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Article
19 sectionsContents
- Characteristics
- History
- Occurrence
- Isotopes
- Compounds
- Production
- Applications
- Industrial processes
- Scientific research
- Preservative
- Laboratory equipment
- Medical use
- Lighting
- Miscellaneous uses
- Safety
- See also
- References
- Further reading
- External links
Argon is a chemical element; it has symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas. Argon is the third most abundant gas in 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.
Nearly all argon in Earth's atmosphere is radiogenic argon-40, derived from the decay of potassium-40 in Earth's crust. In the universe, argon-36 is by far the most common argon isotope, as it is the most easily produced by stellar nucleosynthesis in supernovas.