When do Metallic bonds form?

Metallic bonds, the valence electrons from the s and p orbitals of the interacting metal atoms delocalize

In metallic bonds, the valence electrons from the s and p orbitals of the interacting metal atoms delocalize. That is to say, instead of orbiting their respective metal atoms, they form a "sea" of electrons that surrounds the positively charged atomic nuclei of the interacting metal ions.