In lower-mass stars like the Sun, which elements begin fusing when the helium core reaches about 100 million K?

Answer

Carbon and oxygen

When helium cores in lower-mass stars reach approximately 100 million K, the helium nuclei begin fusing into carbon and oxygen.

In lower-mass stars like the Sun, which elements begin fusing when the helium core reaches about 100 million K?
astronomynebulaElementsFusion