Which gas is abundant in air?

Nitrogen is abundant in the air.

What is in the atmosphere?

The most abundant gas in the atmosphere is nitrogen, with oxygen second. Argon, an inert gas, is the third most abundant gas in the atmosphere. The atmosphere is composed of a mix of several gases in differing amounts. The permanent gases whose percentages do not change from day to day are nitrogen, oxygen and argon. Nitrogen accounts for 78% of the atmosphere, oxygen 21% and argon 0.9%. Nitrogen is so enriched in the atmosphere relative to oxygen because it is very stable in the atmosphere and is not involved to a great extent in chemical reactions.

• There are also trace amounts of carbon dioxide (CO₂), neon (Ne), helium (He), methane (CH₄), krypton (Kr), hydrogen (H₂), nitrous oxide (NO), xenon (Xe), ozone (O₃), iodine (I₂), carbon monoxide (CO), and ammonia (NH₃) in the atmosphere.