Ionic Compounds always have Giant Ionic Lattices. The ions form a closely packed regular lattice arrangement. There are very strong electrostatic forces of attraction between oppositely charged ions, in all directions. A single crystal of Sodium Chloride is one Giant Ionic Lattice, which is why salt crystals tend to be cuboid in shape.
All ionic compounds have similar properties:
- They all have high melting points
- They all have high boiling points
- When they melt, the ions are free to move around and carry and electric current
- They are easily dissolved in water. When this happens the ions seperate and are again free to move and carry an electric current
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