Here's why:

* Sea of Electrons: In metals, the outer electrons are not tightly bound to individual atoms. Instead, they form a "sea" of delocalized electrons that move freely throughout the entire metallic structure.

* Electrostatic Attraction: The positively charged metal ions are held together by the electrostatic attraction to the surrounding sea of electrons. This attraction is strong and non-directional, which explains why metals are good conductors of heat and electricity, malleable (can be hammered into sheets), and ductile (can be drawn into wires).

Let me know if you'd like more details about the metallic bond!