Answer: Argon
Notes: The most abundant naturally occurring gas is nitrogen (N2), which makes up about 78% of air. Oxygen (O2) is the second most abundant gas at about 21%. The inert gas argon (Ar) is the third most abundant gas at 0.93%. Carbon dioxide, helium, ozone, and hydrogen are found in lesser quantities. Apart from these gases, tiny dust particles are also present in the air.
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