The most abundant element in the universe is

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(C) Hydrogen is the most abundant element in the universe,accounting for approximately $3/4$ of its total mass. Helium is the second most abundant ele

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Hydrogen

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(C) Hydrogen is the most abundant element in the universe,accounting for approximately $3/4$ of its total mass. Helium is the second most abundant element,comprising almost all of the remaining $25 \%$. Oxygen is the third most abundant element in the universe. On Earth,however,oxygen is the most common element,making up about $47 \%$ of the Earth's mass.

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