Given that the drift mobility of electrons in copper is 32 cm2 V–1 s–1 , and using values of the electrical conductivity, atomic weight, and density of copper from C&R, compute the number of conduction electrons per atom in copper. (Hint: compute the number of atoms per unit volume in copper, and then compare this to the number of conduction electrons per unit volume (i.e., the carrier density n) computed from copper’s electrical conductivity.) b) In compounds, copper is known to exhibit two common oxidation states, +1 and +2. Discuss whether this fact is consistent with your answer for part a).