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Argon - Wikipedia, the free encyclopedia
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日期：2026-04-23
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.[3] Argon is the third most common gas in the Earth's atmosphere, at 0.93% (9,300 ppm), making it approximately 23.7 times as abund...看更多
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