Primary bonds: Be able to describe ionic, covalent, and metallic bonds - What are their primary characteristics (strength, directionality, etc.), role of the electrons (transferred, shared, or delocalized), what material properties do we expect from these classes of materials, and what is an example of a material bonded in this manner. Secondary bonds (intermolecular forces): fluctuating dipoles (van der Waals bonding) vs. permanent dipoles (e.g. hydrogen bonding). Directionality and role in polymers to produce mechanical properties