1. High electrical conductivity: Metals generally exhibit high electrical conductivity due to the presence of a large number of free electrons in their atomic structure. These free electrons can move freely within the metal lattice, allowing for the efficient flow of electric current. As a result, metals are widely used as conductors in electrical systems and electronic devices.

2. High thermal conductivity: Metals also possess high thermal conductivity. This property enables metals to transfer heat efficiently. When heat is applied to a metal, the free electrons within the metal lattice can quickly absorb and transport thermal energy. This efficient heat transfer makes metals suitable for applications such as cooking utensils, heat sinks, and cooling systems.

3. Malleability and Ductility: Metals are generally malleable and ductile. Malleability refers to the ability of a metal to be hammered or rolled into thin sheets, while ductility is the capacity to be drawn into thin wires. These properties are a consequence of the strong metallic bonds between atoms in the metal lattice. The ability to be shaped and reshaped without breaking makes metals valuable in various manufacturing and construction applications.

These three fundamental properties – high electrical and thermal conductivity, as well as malleability and ductility – underpin the widespread use of metals in a vast range of technological and engineering applications.