What were the primary elements formed during the initial moments of Big Bang nucleosynthesis?

Answer

Hydrogen and Helium (with trace Lithium)

The immediate, intense moments after the Big Bang, when the universe cooled enough for atomic nuclei to form, resulted in the production of only the two lightest elements, Hydrogen and Helium, alongside a trace amount of Lithium.

What were the primary elements formed during the initial moments of Big Bang nucleosynthesis?

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