Argon
chemical element with symbol Ar and atomic number 18; rare gas / From Wikipedia, the free encyclopedia
Argon is a chemical element. Its symbol is argon is Ar and its atomic number is 18. It is part of the noble gas group. It is an odorless and tasteless gas. Argon is the third-most abundant gas in the Earth's atmosphere.
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The name "argon" is from the Greek word ἀργός meaning "lazy" or "inactive" because it does not react with other chemicals.