What elements primarily enrich the cosmos when a star similar to our Sun exhausts its fuel?

Answer

Carbon and Oxygen

Stars of low to intermediate mass fuse hydrogen to helium and then helium into carbon. They lack the mass to fuse further, leaving behind elements vital for life, primarily carbon and oxygen.

What elements primarily enrich the cosmos when a star similar to our Sun exhausts its fuel?
ElementprocessstarFusionnucleosynthesis