Part D Brainstorm ideas about which materials you'll use in your device and how they'll be put together. If you don't have the ideal materials on hand, list any equivalent materials you'll use.​

you should think of what you need for the project, then see what price they are at 3 different stores. After you get this information  get the cheapest and then build the project.

Explanation:

a polar bond is formed when electrons are shared unevenly between atoms