Which elements compound the Sun?
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H and He
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H and N
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H and O
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Uranium
A
Correct answer
Explanation
The Sun is primarily composed of hydrogen (about 73% by mass) and helium (about 25% by mass), with trace amounts of heavier elements. These two elements fuel the nuclear fusion reactions in the Sun's core that produce its energy. The notation 'H and He' correctly identifies these two dominant elements.