To understand and predict bonding in materials, a solid understanding of atomic electronic structure is essential. These tutorials explore the relationship between electronic wavefunctions and atomic orbitals, tailored for sophomore students in an introductory materials science and engineering course. Some prior knowledge of the atom's quantized nature, typically covered in a freshman chemistry course, is assumed. In this final video, we explore the energy states of orbitals and how the presence of multiple electrons in multi-electron atoms affects these energies. We examine how orbital energies vary across the periodic table and how these variations help explain periodic trends in atomic size, effective nuclear charge, electronegativity, and ion size—all of which are crucial for predicting the type of bonding in materials in the solid state.