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1. What are the two most abundant elements in the Universe?
- A. Carbon and Oxygen
- B. Carbon and Oxygen
- C. Carbon and Oxygen
- D. Carbon and Oxygen
Answer: Option D
Explanation:
Hydrogen is the most abundant element in the Universe; helium is second. However, after this, the rank of abundance does not continue to correspond to the atomic number; oxygen has abundance rank 3, but atomic number 8. All others are substantially less common.
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