Argons
Argons are atoms of argon, the chemical element with symbol Ar and atomic number 18. They are colorless, odorless, nonflammable, and largely inert at room temperature; most remain monatomic.
Natural abundance and source: Argon makes up about 0.93% of Earth's atmosphere, making it the third most
Isotopes: The main natural isotopes are Ar-36, Ar-38, and Ar-40, with Ar-40 about 99.6% of natural argon.
Uses: Argons are used as shielding gas in arc welding, for inert atmospheres in metal fabrication and
Safety: Argon is non-toxic and non-flammable, but, as an asphyxiant, it can displace oxygen in confined spaces.
Etymology and history: The name comes from Greek argos, meaning idle. It was identified as a distinct