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Explanation:
- They form crystals. Ionic compounds form crystal lattices rather than amorphous solids.
- They have higher enthalpies of fusion and vaporization than molecular compounds.
- They are hard.
- They are brittle.
- They have high melting points and also high boiling points.
- They conduct electricity but only when they are dissolved in water.
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Explanation:
Ionic compounds typically have high melting and boiling points, and are hard and brittle. As solids they are almost always electrically insulating, but when melted or dissolved they become highly conductive, because the ions are mobilized.
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