Why Do Ionic Compounds Have High Melting Points?

  • Ionic compounds have an equal number of positive and negative ions arranged in the three-dimensional lattice due to which they have high melting points. 
  • The strong force of attraction between oppositely charged ions means that ionic compounds have high melting and boiling points. 
  • When dissolved in water ionic compounds form a solution in which ions can move. This means that these solutions can conduct electricity.
  • Similarly, if ionic compounds are heated up so that they melt the ions can move and molten ionic compounds can also conduct electricity.

The positive and negative ions formed during ionic bonding are held together by enormously strong forces of attraction between the oppositely charged ions. These ionic bonds between the charged particles result in a giant structure of ions. Because the ions are held together tightly in this giant structure it takes a lot of energy to break all the bonds. As a result, ionic compounds have high melting and boiling points.

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