covalent

• • It is between two non metals
• • It involves the sharing of electrons between two non metals.
• • More than one electron pair can also be shared resulting in the formation of single double and triple bonds.
• Simple Molecule

  • Eg – O2, CH4
  • They have weak intermolecular forces in them so have a lower melting and a boiling points
  • The intermolecular forces increases with increase in size as the surface area between the molecules increases.
  • Therefore, polymers which have covalent bonding between them have high melting and boiling point due to increase in chain length.
• Giant Covalent

  • Diamond
  • Graphite
  • Silicon Dioxide
  • Substances which have huge network of atoms joined together by covalent bonds form giant covalent structures.