Which elements are built up in the interiors of aging, massive stars through standard nuclear fusion before exhaustion?

Answer

Carbon, Oxygen, and Iron

Stars spend most of their existence fusing hydrogen into helium, and as they age, particularly the massive ones, fusion continues building up heavier nuclei like carbon, oxygen, and iron in their cores.

Which elements are built up in the interiors of aging, massive stars through standard nuclear fusion before exhaustion?
SpaceastronomycompositionstarsElementsstellar nebula