Ionic Compounds are arranged in a lattice. The electrostatic force between the oppositely charged ions act in all direction and they are also very strong, this hold the lattice together very tightly.
Many ionic compounds will dissolve in water. When we disssolve an ionic compound in water the lattice is split up by the water molecules, and the ions are free to move. In the same way as molten ionic compounds will conduct electricty because the ions in the solution are able to move around.
Simple Covalent Molecules are very strong so the atoms within each molecule are held very tightly together. However, each molecule tends to be quite sperarate from its neighbouring molecules. The covalent compounds have weak intermolecular forces. COVALENT COMPOUND HAVE NO CHARGE = CANNOT CONDUCT ELECTRICITY
Giant Covalent Structures - unlike simple molecular structures, when a giant covalent structure melts or boils, the covalent bonds break. They have very high melting and boiling points and they dont conduct electricty(except graphite).
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