Q.6 Differentiate between ionic crystals and covalent crystals.
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Answer:
| Ionic crystals | Covalent (network) crystals |
|---|---|
| Constituent particles are positive and negative ions. | Constituent particles are atoms. |
| Particles are held by strong electrostatic (ionic) attraction. | Atoms are held by a continuous network of covalent bonds. |
| Hard but brittle; high melting points. | Very hard (e.g. diamond); very high melting points. |
| Insulators in the solid state but conduct electricity in the molten state or in aqueous solution. | Usually insulators in all states (graphite is an exception). |
| Examples: NaCl, KCl, MgO. | Examples: diamond, SiO2 (quartz), SiC. |
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