Why do metals have a good lustre and good electrical conductivity?

Metals have a good lustre due to their ability to reflect light effectively, which is a result of their free electrons that allow for the absorption and re-emission of light at various wavelengths. Additionally, metals exhibit good electrical conductivity because these free electrons can move easily through the metal lattice, facilitating the flow of electric current. This combination of properties is largely attributed to the metallic bonding structure, where electrons are delocalized and not bound to individual atoms.