What is the most abundant element in the universe by mass?
A
Carbon
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B
Oxygen
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C
Helium
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D
Hydrogen
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Solution
The correct option is D
Hydrogen
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