Primordial nucleosynthesis refers to the Big Bang making all elements up to iron.

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Primordial nucleosynthesis, or Big Bang nucleosynthesis, refers to the production of nuclei other than those of the lightest isotope of hydrogen (hydrogen-1, $^1H$, having a single proton as a nucleus) during the early phases of the universe. It primarily resulted in the formation of hydrogen-1, helium-4, helium-3, and traces of lithium-7. Elements heavier than lithium, up to iron, are mainly produced in stars and supernovae, not in the Big Bang.

Primordial Nucleosynthesis Refers to the Big Bang Making All Elements