CHEM 1301 Chapter Notes - Chapter 8.4: Nonmetal, Room Temperature, Coordination Number

• School: University of Manitoba
• Department: Chemistry
• Course: CHEM 1301
• Professor: Sarrah Vakili

Document Summary

There are four major solid types: molecular solids (or atomic, network solids, metallic solids, ionic solids. In atomic solids (for example, noble gases) the individual atoms are held together by dispersion forces. They physical properties reflect the vary weak attractive forces among the atoms. These solids are soft, have very low melting points (-249 deg for neon and -71 deg for random) and boiling points, raising smoothly with increase molar masses. Atomic solids are poor thermal and electrical conductors. The molecular solids are solids composed of individual molecules, occupying the lattice points. These molecules are held to one another by: hydrogen bonds, (if they can form them, dipole-dipole forces (if they can form them, and dispersion forces. Molecules of the molecular solids retain their individual properties. In polar and nonpolar molecular solids: formula represents a molecule. Room temperature gases and liquids usually form molecular solids at low temperature.