Approximately what percentage of Earth's atmosphere is oxygen?

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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

Approximately what percentage of Earth's atmosphere is oxygen?

Explanation:
The main idea here is knowing how the air is composed by volume. Oxygen makes up roughly one-fifth of the atmosphere, about 21%. The largest portion is nitrogen, around 78%, with the rest being small amounts of other gases. So 21% is the best estimate for the oxygen content. The other options are either a much larger share (nitrogen) or far too small to be correct.

The main idea here is knowing how the air is composed by volume. Oxygen makes up roughly one-fifth of the atmosphere, about 21%. The largest portion is nitrogen, around 78%, with the rest being small amounts of other gases. So 21% is the best estimate for the oxygen content. The other options are either a much larger share (nitrogen) or far too small to be correct.

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