Think about what is free to move around to conduct electricity in solid metals .
When the metals are bounded up into a compound , these are no longer free to move . Also one of those two things doesn't exist in a solid state , only in aqueous or gaseous states .
Both ! There are no free electrons because they are tightly bound to the positive and negative ions. The ions themselves are not free to move because they are tightly bonded, there is a strong electromagnetic or electrostatic force of attraction between the positive and negative ions, ie. ionic bonds.