Question

why do metallic compounds conduct electricity as solids? core electrons are mobile, allowing electricity to flow through the metal valence electrons are mobile, allowing electricity to flow through the metal protons are mobile, allowing electricity to flow through the metal the metal cations are mobile, allowing electricity to flow through the metal

Explanation:

Metallic compounds have a sea of delocalized valence electrons. These electrons are free to move throughout the metal lattice in the solid state. Core electrons are tightly bound to the nucleus and not mobile. Protons are in the nucleus and not mobile. Metal cations are fixed in the lattice (in the solid state, they have a regular arrangement and are not freely mobile like the valence electrons). The movement of valence electrons is what enables the conduction of electricity.

Answer:

valence electrons are mobile, allowing electricity to flow through the metal (the purple - colored option)