2. How does our understanding of metallic bonding help to explain conductivity of metals?
The Metallic Bonding is described with The Electron Sea Model. The positive nuclei of the atoms are surrounded by a sea of electrons. Those electrons are free.
So, how does our understanding of metallic bonding help to explain conductivity of metals?
Because the electrons in the electron sea are free to flow and carry electric current. That's why Metals are good conductors of electricity.