A. Lower melting point than molecular crystals
B. Discrete molecules linked by Van der Waals forces
C. Higher melting point than molecular crystals
D. None of these
Brief Facts About Covalent Crystals:
Covalent crystals are hard, frequently brittle materials such as diamond, silicon, and silicon carbide. In the simpler, monatomic types (e.g., diamond), each atom is surrounded by a number of atoms equal to its valence. All of these related crystals contain atoms that are tightly packed and difficult to separate. Their structure varies widely from the atoms in molecular crystals such as water and carbon dioxide which are easily separated