But it the star is't a gas core made of Iron mixed with Hydrogen, Helium and other intermediate stuff, or it's a solid metallic almost pure Iron like on Earth? (IANAG neither)
For a sufficiently massive star, all of the hydrogen, helium, carbon, neon, oxygen, and silicon in the core are gone after silicon burning is complete.
They were consumed as fuel to maintain the outward pressure of the core.
