Which gas is the most abundant in Earth's atmosphere?

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Study for the WJEC GCSE Chemistry Exam. Utilize flashcards and multiple choice questions, each with hints and explanations. Prepare effectively for your exam!

Multiple Choice

Which gas is the most abundant in Earth's atmosphere?

Explanation:
The atmosphere is made up mostly of two gases, with nitrogen being the dominant one. By volume, about 78% of the air is nitrogen, while oxygen makes up roughly 21%. The rest—argon and carbon dioxide—appears only in tiny amounts. Because nitrogen is by far the largest share, it is the most abundant gas in Earth's atmosphere.

The atmosphere is made up mostly of two gases, with nitrogen being the dominant one. By volume, about 78% of the air is nitrogen, while oxygen makes up roughly 21%. The rest—argon and carbon dioxide—appears only in tiny amounts. Because nitrogen is by far the largest share, it is the most abundant gas in Earth's atmosphere.

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