What is the primary characteristic of metals?

The primary characteristic of metals is that they conduct heat and electricity well. This property arises from the structure of metals, where the atoms are arranged in a lattice and have free-moving electrons, often referred to as "delocalized electrons." These electrons allow metals to efficiently transfer thermal energy as well as electrical current.

This conductive ability is why metals are widely used in various applications, such as electrical wiring and cookware, where efficient heat transfer is essential. The conductivity of metals is one of their defining features and distinguishes them from non-metals, which typically do not share this property.