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

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Prepare for the WJEC GCSE Chemistry Exam with multiple choice questions and detailed explanations. Enhance your knowledge and boost your confidence. Get exam-ready today!

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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