What were the primary elements formed during the universe's Big Bang nucleosynthesis?

Answer

Hydrogen, most Helium, and trace Lithium

The very first, simplest atoms formed within the first few minutes of the universe's expansion and cooling, yielding almost exclusively Hydrogen, most of the Helium found today, and only trace amounts of Lithium.

What were the primary elements formed during the universe's Big Bang nucleosynthesis?

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