Crystal silicon and silicon dioxide belong to atoms or molecular materials?
In crystals such as atomic crystals, the particles on the lattice are atoms, and the atoms are bonded together by covalent bonds called crystals. Such as diamond crystal, elemental silicon, SiO2 and so on, are atomic crystals.
A crystalline structure in which the adjacent atoms are joined by strong covalent bonds; a network of crystals called atomic crystals.
In atomic crystals, there is no independent small molecule, but only the whole crystal is considered as a macromolecule. The covalent bond between the atoms interact with each other is very strong, want to break these keys and make the crystal melting must consume a lot of energy, so the crystal atoms generally have a high melting point, boiling point and hardness, not conductive normally, poor conductor is hot. It does not conduct electricity when melted, but semiconductor silicon can conduct electricity conditionally.
