Metallic bond

Intramolecular bonding within metals is called metallic bonding. It involves the delocalised sharing of free electrons between a lattice of metal nuclei.

Metallic bonding, as with covalent bonding is non-polar, in that there is no (for pure elemental metals) or very little (for alloys) electronegativity difference among the atoms participating in the bonding interaction, and the electrons involved in that interaction are delocalized across molecular orbitals. It is also akin to ionic bonding and distinct from covalent bonding in that the interatomic forces are largely anisotropic and are extensive throughout the chemical, rather than being confined to a discrete molecule.