Some substances are good conductor of electricity in both the solid and liquid states. These substances are generally______________ ?

B. metallic substances

Metallic substances are good conductors of electricity in both the solid and liquid states. This is because metals have a large number of free electrons in their outermost energy level, which are able to move easily and carry electric current throughout the material. This property makes metals useful in electrical applications, such as wiring and electrical components.

A. Ionic substances are not good conductors of electricity in the solid state, but they can be good conductors in the molten or dissolved state because their ions are free to move and carry electric current.

C. Molecular solids are not good conductors of electricity because their molecules are held together by weak bonds and do not allow for free movement of electrons.

D. Covalent network solids are also not good conductors of electricity because their atoms are bonded covalently, forming a three-dimensional network that does not allow for free movement of electrons.