Molecular Solids
Solid composed of molecules as constituent particles. These solids can further be categorized into following types:
- Non polar Molecular Solids:
- They are composed of either atom.
- H2, Cl2 and I2.are some of the typical example.
- In non-polar Molecular solids the comprised atoms or molecules are held together by weak dispersion forces or London forces.
- They are soft and non-conductors of electricity.
- They have low melting points and usually exist in liquid or gaseous state at room temperature and pressure.
(ii) Polar Molecular Solids:
- The molecules like HCl, SO2, are formed by polar covalent bonds.
- In polar Molecular solids the comprised atoms or molecules are held together by stronger dipole-dipole interactions.
- They are soft and non-conductors of electricity.
- The melting points of these solids are higher than those of non-polar molecular solids and usually exist in liquid or gaseous state at room temperature and pressure.
- Molecules like SO2 and solid NH3 are some examples of such solids.
(iii) Hydrogen Bonded Molecular Solids:
- Hydrogen Bonded Molecular Solids contain polar covalent bonds between H and F, O or N atoms.
- Strong hydrogen bonding binds molecules of such solids like H2O (ice).
- They are non-conductors of electricity and are volatile liquids or soft solids under room temperature and pressure.
