Answer:
Ionic solids: Solids in which constituent particles are held by ionic bonds are called ionic solids. Ionic solids are made of ions (cations and anions). In ionic solids cations and anions are bound by strong electrostatic forces of attraction (coulombic force). Ionic solids are formed by three dimensional arrangements of cations and anions. e.g., NaCI, ZnS, etc.
Properties of ionic solids
(a) Ionic solids are hard but brittle in nature.
(b) They have high melting points and boiling points.
(c) In these solids neither ions are free to move nor they have free electrons, hence these are electrical insulators.
Examples: Sodium chloride(NaCl), Zinc sulphide(ZnS), etc.
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