Multiple choice

The most abundant inert gas in the atmosphere is

  1. Helium

  2. Neon

  3. Argon

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

Argon is the third most abundant gas in Earth's atmosphere (approximately 0.93% by volume), making it the most abundant noble/inert gas. Helium, neon, and krypton are also inert gases but exist only in trace amounts - helium at about 0.0005%, neon at 0.0018%, and krypton at about 0.0001%. Argon's abundance comes from the radioactive decay of potassium-40 in Earth's crust.

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