Here is a video of ionic and covalent bonding. Here is a slightly odd video introduction to bonding that mentions that models simplify the complex realities
You can use any text resources, to find examples of models of how metals are held together.
Compare the models to each other. What is clear/not clear?
Using any text resources and models in the room find examples of models of how ionic substances are held together.
Compare the models of ionic materials to each other. What is clear/unclear?
How do the forces holding metals together compare and contrast with ionic substances?