Which of the following elements exists in maximum quantity in atmosphere? (UPSC Prelims 1986)

Q. Which of the following elements exists in maximum quantity in atmosphere? (UPSC Prelims 1986)
Answer: Nitrogen
Notes: According to NASA, the gases in Earth's atmosphere include:
Nitrogen — 78 percent, Oxygen — 21 percent, Argon — 0.93 percent, Carbon dioxide — 0.04 percent. Trace amounts of neon, helium, methane, krypton and hydrogen, as well as water vapor.

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