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File:Argon_discharge_tube.jpg · Wikimedia Commons · See Wikimedia Commons

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Also known as Ar, element 18, 18Ar

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.

OverviewAI-generated

Argon is a chemical element with the symbol Ar and atomic number 18. Its standard molar entropy is 154.8, and it has a mass of 39.95. The element’s electron configuration is listed as 1s² 2s² 2p⁶ 3s² 3p⁶, or [Ne] 3s² 3p⁶. It was discovered in 1894.

The substance has a melting point of -189.34 and a boiling point of -185.85. Its speed of sound is 813, and its dynamic viscosity is 22.7. Argon is represented by the Unicode character 氬. It has zero hydrogen bond donors and acceptors, with a charge of 0.

Synthesized by Vinony from 27 facts across 4 sources: Wikidata, PubChem, PubMed, Vinony graph. Generated from structured data (not the Wikipedia text) and checked against those facts — may still contain errors.

Chemical data

Formula
Ar
Molecular weight
39.9 g/mol
IUPAC name
argon
SMILES
[Ar]
InChIKey
XKRFYHLGVUSROY-UHFFFAOYSA-N
Polar surface area
0 Ų
H-bond donors
0
H-bond acceptors
0
Formal charge
0

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