The material is neutralized when it clumps together in the central regions of the star, this material is called iron/nickel alloy. It clumps as a process called homogeneous nucleation and subsequent grain growth. It is covered in this paper:
http://vixra.org/abs/1512.0116
The reason why it is iron/nickel is because of the ionization energies. They are harder to ionize, so they are subsequently the first to drop to lower energies when the star cools, this is why it is in the center (and all ancient/dead stars have iron/nickel cores). That rule of thumb is based off the plasma experiments which established the idea of Marklund convection. The plasma chemically differentiates, entering into cooler regions (the central regions). https://en.wikipedia.org/wiki/Marklund_convection
This happens inside of the star. The star forms the "planet" in its interior. We don't get to see the end result until the outer layers of the star have dissipated and evaporated, leaving the solid body in the center.
Just make sure that this clumping happens inside the star, not in vacuum where there is nothing preventing heat loss (vacuum of outer space is a fantastic heat sink). If astronomers are to heat liquid iron/nickel in outer space absent the heat, gravitation and refractory material required to form huge pure iron/nickel meteorites then their credibility is in serious jeopardy. I overview this in this paper:
http://vixra.org/abs/1512.0455