Which property is characteristic of metals?

• A. Soft, brittle
• B. High thermal & electrical conductivity
• C. Non-conducting
• D. Transparent

Answer: (B)

Metals conduct heat and electricity well because of metallic bonding, where electrons are delocalized and move freely like a sea around a lattice of positively charged ions. This freely moving electron cloud allows electric charges to flow with little resistance, and it also rapidly transfers vibrational energy between atoms, making metals excellent heat conductors. That combination—free electrons enabling efficient charge and energy transport—is why high thermal and electrical conductivity is a hallmark property of metals. In contrast, materials described as non-conducting lack these mobile electrons, so they don’t conduct electricity, and metals are typically opaque rather than transparent because those free electrons interact with visible light rather than letting it pass through. Similarly, calling a material soft and brittle doesn’t capture the defining conductivity behavior of metals, although some metals can be malleable or brittle under certain conditions.