Natural Science CLEP Prep Practice Exam

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Prepare for the CLEP Natural Science Exam with our comprehensive study materials and practice questions. Test your knowledge and ace the exam by mastering key concepts.

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

What chemical elements are the most abundant in the atmosphere?

Carbon
Hydrogen
Oxygen
Nitrogen

The correct answer is: Nitrogen

Nitrogen is the most abundant chemical element in the atmosphere, making up approximately 78% of the air we breathe. While carbon, hydrogen, and oxygen are also present in the atmosphere, they are not as abundant as nitrogen. Carbon and oxygen are essential for life and are present in the form of carbon dioxide, while hydrogen is mostly found in the form of water vapor. However, their concentrations in the atmosphere are much lower compared to nitrogen. Therefore, options A, B, and C are incorrect.