argon
UK /ˈɑːɹɡɒn/ US /ˈɑːɹɡɒn/
noun 2
Definitions
noun
1
The chemical element (symbol Ar) with an atomic number of 18. The third most abundant gas in the Earth's atmosphere, it is a colourless, odourless, inert noble gas.
2
A single atom of this element.
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