A. Neither Electrically conductive materials ;Both Hard materials
B. Neither Electrically conductive materials ;Diamond only Hard materials
C. Buckminsterfullerene only Electrically conductive materials;Both Hard materials
D. Buckminsterfullerene only Electrically conductive materials;Diamond only Hard materials
参考答案:
B
本题详细解析:
Neither material is electrically conductive. Diamond has no delocalized electrons, while the delocalized electrons in buckminsterfullerene are confined within the molecule. There is no extended lattice of bonds through which the electrons can move in response to an applied potential difference. Diamond is a hard material; a large force is required to break the strong covalent bonds between atoms.
Buckminsterfullerene, however, is soft, as only a small force is needed to overcome the weak intermolecular (London / dispersion) forces between molecules.
This question is moderately difficult, as the student must recall multiple features of the two carbon allotropes or deduce their physical properties from the diagrams given.
