Final answer:
The fact that electrons are delocalized and able to move freely in metallic crystals is responsible for several properties of metals, including electrical conductivity, malleability, and ductility. option d is correct.
Step-by-step explanation:
The fact that electrons are delocalized and able to move freely in metallic crystals is responsible for several properties of metals, including electrical conductivity, malleability, and ductility.
Because the electrons are not confined to a specific atom and can move throughout the entire crystal, metals are able to conduct electricity. This is because when a voltage is applied, the delocalized electrons can easily flow through the crystal lattice, carrying the electric current.
Additionally, the ability of metals to be easily shaped is due to the movement of the delocalized electrons. When a force is applied, the electrons can move and reorient themselves, allowing the metal to be bent or hammered into different shapes, leading to the properties of malleability and ductility.