Metallic bonds joins atoms of metals and atoms of alloys together. The copper used in making pennies is a metallic substance so it contains metallic bonds.
The formation of this bond type is predicated on the large atomic radius, low ionization energy and large number of electrons in the valence shell.
The bond is an attraction between the positive nuclei of all closely packed atoms in the lattice and the electron cloud.
The electron cloud is jointly formed by all the atoms by losing their outermost shell electrons.
This way the bond in pennies are metallic in nature.
