Four general properties of metals are:
1. **Conductivity:** Metals are typically good conductors of heat and electricity. This property arises from the delocalized electrons present in the metallic structure, which can move freely and carry electric current or transfer heat energy efficiently.
2. **Malleability:** Metals can be hammered, rolled, or pressed into thin sheets without breaking. This property is due to the ability of metal atoms to slide past each other when subjected to external forces, allowing the material to be reshaped without fracture.
3. **Ductility:** Metals can be drawn into thin wires without breaking. Similar to malleability, this property is a result of the ability of metal atoms to undergo plastic deformation and rearrange themselves without disrupting the overall structure of the material.
4. **Luster:** Metals have a characteristic shiny or metallic luster when polished or freshly cut. This is due to the reflection of light by the delocalized electrons in the metal's surface, which gives metals their distinctive appearance.
