Answer :
The era of nucleosynthesis came to an end about 5 minutes after the big bang, which is when it was discovered what the universe's fundamental chemical make-up was.
Why did the era of nucleosynthesis, which lasted for around 5 minutes after the Big Bang, see the end of fusion?
A few minutes later, the cosmos got too cold, and nucleosynthesis ceased. Since nucleosynthesis was no longer possible, the deuterium that was still there at that time just remained deuterium. It had not yet fused into any heavier nuclei.
Why did the age of the nuclei, which lasted for around 380,000 years, come to an end?
In order for stable, neutral atoms to form, the cosmos had expanded and cooled to a temperature of roughly 3,000 K.
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