The group 4B metal nitrides (TiN, ZrN, and HfN) as well as the group 5B metal nitrides (VN, NbN, and TaN) are all superconductors at low temperature. Niobium(1111) nitride, which has the highest Tc, superconducts below 16.1 K All of these compounds have crystal structures that are analogous to the sodium chloride structure. Scandium nitride also adopts the sodium chloride structure, but it is not a superconductor. (a) At room temperature will NbN be a metallic conductor or an insulator? (b) At room temperature will ScN be a metallic conductor or an insulator? (c) Why do you think the properties of ScN are so different than the group 4B and 5B metal nitrides? (Hint: Consider the electron configuration of the metal cation.)
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