Metals are generally good conductors of which properties?

• A. Good conductor of heat and electricity.
• B. Poor conductor of heat.
• C. Insulator for electricity.
• D. Transparent to light.

Answer: (A)

Metals conduct both heat and electricity well because they have a sea of free electrons that can move easily through the lattice. These delocalized electrons respond quickly to an electric field, carrying charge with little resistance, which gives high electrical conductivity. They also transfer kinetic energy rapidly as heat between atoms, making metals efficient thermal conductors. That’s why metals are used in electrical wires and heat exchangers.

The idea that metals are poor conductors of heat, or that they are insulators for electricity, doesn't fit with how metals behave. Metals are not typically transparent to light either; they are usually opaque and reflective rather than letting light pass through.