• There are four types of crystals: (1) ionic, (2) metallic, (3) covalent network, and (4) molecular.
  • Properties and several examples of each type are listed in the following table.
  • Ionic crystals are hard and brittle and have high melting points.
  • Metallic crystals consist of metal cations surrounded by a “sea” of mobile valence electrons.
  • Molecular crystals typically consist of molecules at the lattice points of the crystal, held together by relatively weak intermolecular forces.
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