Metal Cores The Terrestrial Planet Cores Contain Mostly Metal Because?

The terrestrial planet cores contain mostly metal because? - metal cores

Radioactivity produced metals in the core of the decay of uranium.
Convection takes place at the base of the metals.
Metals decreased in the middle, both inside and melted everywhere.
First Metals condensed in the solar nebula and the rocks were deformed around them.
All the planets are mostly made of metal.