If the transfer integral of these particles is small, the repulsion between them can lead to the Mott transition. If these particles are “nearly free” but weakly interact with a periodic potential, Bloch’s theorem (10[1])can be used to compute their band structure. Superconductivity is caused by bound pairs of these particles (10[1])theorized by (10[1])Leon Cooper. Places in a lattice where these particles don’t exist are called holes. (10[2])If a photon’s energy (10[1])exceeds a material’s (10[1])work function, it can eject one of these particles in an effect (10[1])whose description won Albert Einstein the Nobel Prize. For 10 points, name these negatively-charged particles (10[1])whose orbitals surround the nuclei of atoms. ■END■