Bonds & ions
Metallic bond — ধাতব বন্ধন
Quick answer
A metallic bond is the attraction between a lattice of positive metal ions and the sea of delocalized electrons flowing around them.
Definition
In a metal, each atom sheds its outer electrons into a common pool. The result is a lattice of positive ions immersed in a ‘sea’ of delocalized electrons that belong to no single atom, and the attraction between the two is the metallic bond. This freely moving electron sea explains why metals conduct heat and electricity so well, why they can be hammered into sheets or drawn into wires without shattering, and why their surfaces shine.
For example
A copper wire carries current because its electron sea drifts as soon as you flick the switch; an iron nail can be hammered flat without shattering, unlike brittle salt crystals.