Explain (i) The basis of similarities and differences between metallic and ionic crystals. (ii) Ionic solids are hard and brittle.
(i) The foundation of similarities among metal and ionic crystals is that each those crystal kinds are held with the aid of using the electrostatic pressure of appeal. In metal crystals, the electrostatic pressure acts among the high-quality ions and the electrons. In ionic crystals, it acts among the oppositely-charged ions. Hence, each have excessive melting points.The foundation of variations among metal and ionic crystals is that during steel crystals, the electrons are loose to move and so, steel crystals can behavior electricity. However, in ionic crystals, the ions aren't loose to move. As a result, they can't behavior electricity. However, in molten kingdom or in aqueous solution, they do behavior electricity. (ii) The constituent debris of ionic crystals are ions. These ions are held collectively in three-dimensional preparations with the aid of using the electrostatic pressure of enchantment. Since the electrostatic pressure of appeal could be very strong, the charged ions are held in constant positions. This is the motive why ionic crystals are difficult and brittle.
