Multiple choice

The most abundant inert gas in the atmosphere is

  1. xenon

  2. krypton

  3. argon

  4. helium
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Argon constitutes approximately 0.93% of Earth's atmosphere, making it the most abundant noble gas. Helium, xenon, and krypton are present in much smaller concentrations. Argon's abundance comes from the radioactive decay of potassium-40 in Earth's crust.

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