Lecture
This lecture covers the concept of electronegativity, explaining how atoms tend to donate or accept electrons based on their position in the periodic table. It also delves into ionic bonds, hydrogen bonding, and the relationship between electronegativity and bond type. The instructor discusses examples of ionic bonds, the properties of hydrogen bonds, and their role in DNA structure. Furthermore, the lecture explores molecular orbitals, band structure, and the behavior of different materials in 3D, 2D, 1D, and 0D objects, emphasizing the evolution of band gaps at different scales.