1. High melting and boiling points
The ionic bond is very strong and so large amounts of energy is required to seperate the bonds.
2. Conduct electricity when molten or in aeqeus solution
When solid, the ions are fixed in position and can't move. Once heated the ions are free to move. The electrical current is a flow of ions.
3. Most ionic compounds are water soluble
4. They form crystals.
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