In the Big Bang, about 75% of the normal matter by mass was hydrogen atoms, and the other 25% almost entirely helium.

Name: In the Big Bang, about 75% of the normal matter by mass was hydrogen atoms, and the other 25% almost entirely helium.
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During the Big Bang nucleosynthesis, the universe was hot enough for nuclear fusion to occur, leading to the formation of hydrogen (about 75% by mass) and helium (about 25%), with trace amounts of lithium and beryllium.

In the Big Bang, About 75% of the Normal Matter