Answer
See the answer below.
Work Step by Step
a) Network solid (high number of bonds of each creates the network), atoms, covalent bonds, semiconductor
b) Amorphous solid (noncrystalline), molecules, covalent bonds with atoms in the same polymer molecule and London forces with the ones in others, thermal insulator.
c) Network solid (same reason as a), atoms, covalent bonds, very hard material
d) Ionic solid, ions, ionic interaction, very high melting point
