What is typically the composition of a conductor?

The composition of a conductor is characterized by its ability to facilitate the flow of electric current, which is largely influenced by the number of valence electrons. Conductors, such as copper and aluminum, are metals that typically have one or two valence electrons in their outer shell. These electrons can easily move when an electric field is applied, allowing electricity to flow through the material.

This property is essential for conductors, as the mobility of these electrons is what enables efficient electrical conduction. The presence of one or two valence electrons greatly enhances the metal's conductivity compared to materials with full or nearly full valence shells, where electrons are tightly bound and not free to move.

The other choices do not accurately describe conductors. Nonmetals are generally insulators, and containing many electrons in inner orbits refers more to atomic structure rather than conductive properties. Insulators, by contrast, do not allow easy flow of electric current due to their filled valence shells, further differentiating them from conductors.