What is the most abundant gaseous element in the air?

Nitrogen is the most abundant gaseous element in the air.

Nitrogen = 78%

Oxygen = 20.9%

Argon = 0.9%

Carbon Dioxide = 0.03%

Other Gases = 0.17%

Answer: The most abundant gas in the atmosphere is nitrogen.

Explanation:

The Earth's atmosphere is composed of approximately 78 percent nitrogen, 21 percent oxygen, 1 percent argon and trace amounts of other gases that include carbon dioxide and neon.