Bonding

So Far Ionic Bonds Covalent Bonds: Van der Waals bonding sp3 orbitals Point Charge Model Actually can have a polar/ionic character Van der Waals bonding Synchronized instantaneous dipoles in molecular solids (e.g. inert gases such as Ne and Ar) Others: polar molecules and polymers Metallic Bonds: more detail later Mixed Bonds and Macroscopic Properties

Electronegativity and Mixed Bonds Diamond, polymers Graphite H-bonded polymers Liquid Crystals Ionic Glasses Doped Semiconductors Complex Salts Alloys Ionic Ceramics Alkali Metals 1 http://www.chemguide.co.uk/atoms/bonding/electroneg.html

Macroscopic Properties Melting Temperature Elastic Moduli – see Kasap Example Thermal Expansion