ICSE Class 10 Answered

     When metal bond with themselves, they bond in a different way when they bond with other elements. It isn't ionic or molecular or covalent. It is its own metal bond.

Most metals have very few electrons in their outermost energy shells, and some have vacant outer electron orbitals. What this means to a metal is that its valence electrons are decentralized and free to move around. Remember that in ionic bonds, the electrons transfer from one atom to another atom. In covalent bonds, the electrons are shared between atoms. In metal bonds, the electrons wander around and aren't transferred or shared. It's more of a communal thing where they belong to all the metal atoms around them.

The attraction between the mobile electrons and positive centers is a metallic bond.

Hence metallic conductors are not transferred matter and there is no chemical change even there is a movement of electrons.