How does the presence of delocalized electrons affect the properties of metals?

The presence of delocalized electrons in metals significantly contributes to their unique properties, particularly in terms of malleability. Delocalized electrons form a "sea of electrons" that are free to move throughout the metal lattice. This mobility allows metal atoms to slide past each other without breaking the metallic bond, which is what enables metals to be deformed under stress without fracturing.

In practical terms, this means that when a force is applied to a metal, the layers of atoms can shift smoothly, making the metal malleable. This is why metals can be hammered into thin sheets or drawn into wires without losing structural integrity.

While delocalized electrons also play a role in enhancing conductivity and ductility, their effect on malleability is particularly pronounced, allowing for various applications in manufacturing and material fabrication. Thus, the correct choice reflects a fundamental property of metals that arises from the behavior of their electrons.