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Option 2 : Argon
- Argon is the most abundant noble gas and the third most abundant gas in the earth's atmosphere.
- It occupies about 0.93% of the air by volume.
- Argon (Ar) is the third noble gas in the periodic table and its atomic number is 18.
- Noble gases are odorless and colorless gases that have very low reactivity on account of their completely full valence shell.
- Comprising 0.00015% of the Earth's crust, Argon is also the most abundant noble gas in the Earth's crust.
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