For a gas acting as one of these materials, the secondary emission coefficient, pressure, and gap distance are put into Paschen’s law to calculate breakdown voltage. Bismuth antimonides exemplify a type of these materials with symmetry-protected surface states, their topological (10[1])variety. A sphere made of one of these materials has excess charges pinned to their initial position in (-5[1])Gauss’s law problems. These materials have a large band gap. A polarizable one of these materials can increase the capacitance (-5[1])of a parallel-plate capacitor by acting as a dielectric. (-5[2])These materials have high resistivity and include rubber and plastic. (10[1])For 10 points, name these materials which do not conduct electricity. ■END■ (10[3]0[1])