Delocalized electrons: Electrons of an atom, molecule or metal that are not associated with a particular atom or a selected covalent bond. As an alternative, they roam freely. Delocalized electrons are attribute of metallic bonds and often are referred to as a sea of electrons. Response with oxygen: Metal oxides https://www.avonlighthouse.com/sturdy-benefits-of-a-metal-storage-shed-at-your-behest/