1) Diamond

• All the atoms in giant covalent structures are linked by strong covalent bonds.
• These bonds must be broken for the substance to melt or boil.
• This means that giant covalent structures have very high melting and boiling points.
• Diamond is a form of carbon:

  • It has a giant, rigid covalent structure (lattice).
  • Each carbon atom forms four strong covalent bonds with other carbon atoms.
  • All the strong covalent bonds mean that it is a very hard substance with a very high melting point.
  • There are no charged particles, so it does not conduct electricity.