Lecture 12: Metallic Bonding, Band Theory of Solids (Heitler and London), Band Gaps in Metals, Semiconductors, and Insulators, Absorption Edge of a Semiconductor

//"It will be a three-hour extravaganza, a celebration of learning where you all come to show you what you have mastered. And it is going to be just a grand, grand time. And it will be over in the Joh