ARGON

Argon

Argon is a chemical element with 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 common gas in the Earth's atmosphere, at 0.93%, making it approximately 23.8 times as abundant as the next most common atmospheric gas, carbon dioxide, and more than 500 times as abundant as the next most common noble gas, neon . Nearly all of this argon is radiogenic argon-40 derived from the decay of potassium-40 in the Earth's crust. In the universe, argon-36 is by far the most common argon isotope, being the preferred argon isotope produced by stellar nucleosynthesis in supernovas.

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argon

Noun

  1. A chemical element (symbol Ar) with an atomic number of 18.


The above text is a snippet from Wiktionary: argon
and as such is available under the Creative Commons Attribution/Share-Alike License.

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