Conduction in solids can occur via which mechanisms?

Conduction in solids can occur via which mechanisms?

• A. Movement of electrons is the primary mechanism for conduction in metals
• B. Movement of ions is the primary mechanism for conduction in metals
• C. Conduction cannot occur in solids
• D. Photons carry all the conduction

Answer: (A)

Electric conduction in metals is dominated by the mobile electrons. In a metal, many electrons are not bound to any particular atom; they form a delocalized sea that can move through the lattice of positively charged ions. When a voltage is applied, these free electrons gain a net drift and carry electric charge through the material, while the ions mainly provide the fixed lattice and scatter the electrons. Moving ions would require ion migration, which is characteristic of ionic conductors and is much less feasible in metals due to their strong bonds and the ions’ large mass. Photons do not carry electric charge and thus do not account for conduction. So the primary mechanism in metals is the movement of electrons. In other solids, ions or other carriers may contribute, but metals rely on electrons for conduction.

Electric conduction in metals is dominated by the mobile electrons. In a metal, many electrons are not bound to any particular atom; they form a delocalized sea that can move through the lattice of positively charged ions. When a voltage is applied, these free electrons gain a net drift and carry electric charge through the material, while the ions mainly provide the fixed lattice and scatter the electrons. Moving ions would require ion migration, which is characteristic of ionic conductors and is much less feasible in metals due to their strong bonds and the ions’ large mass. Photons do not carry electric charge and thus do not account for conduction. So the primary mechanism in metals is the movement of electrons. In other solids, ions or other carriers may contribute, but metals rely on electrons for conduction.