Ionic compounds are non-molecular species, and melting requires that the strong ionic bonds that constitute the electrostatic lattice be disrupted. ionic compounds are formed by transfer of electrons from a metal to a non metal and are held Together by strong electrostatic force between the oppositely charged ions. It clearly requires high temperatures. 1. That's why ionic compounds have much higher melting and boiling points than covalent molecules. 7. a) Describe metallic bonds. The electrostatic attraction (ionic bond) between cations and anions is strong. The strong intermolecular attraction is also the reason ionic compounds are mostly solid at room temperature. Covalent molecular compounds, in contrast, consist of discrete molecules held together by weak intermolecular forces and can be gases, liquids, or solids at room temperature and pressure. Physical Properties of Ionic Compounds: High Melting Point. 1:42 understand why compounds with giant ionic lattices have high melting and boiling points; 1:43 Know that ionic compounds do not conduct electricity when solid, but do conduct electricity when molten and in aqueous solution (g) Covalent bonding. It takes a lot of energy to overcome this attraction in order to allow the ions to move more freely and form a liquid. 1:44 know that a covalent bond is formed between atoms by the sharing of a pair of electrons Ionic compounds have an equal number of positive and negative ions arranged in the three-dimensional lattice due to which they have high melting points. b) Explain why mercury has a surface tension that is six times greater than the surface tension of water. Well, it's usually high. Ionic compounds have high melting points. Ionic compounds have high melting points because there is a strong electrostatic force of attraction between the oppositely charged ions and hence a large amount of energy is required to break the strong bonding force between ions. so , a large amount of energy is required to break the from inter ionic attraction .so ionic compounds have high melting point. The strong force of attraction between oppositely charged ions means that ionic compounds have high melting and boiling points. Ionic compounds have high melting and boiling points because the ionic bonds that hold the compounds together are very strong and require a great deal of energy to break apart. Metallic bonds consist of positively charged metal ions surrounded by valence electrons. best example:-Nacl Na+ and Cl-. Hope this helps. hence the MP of ionic compounds and more than covalent or other compounds. This is directly correlated to their high melting points. Ionic compounds have much melting point than other compounds becoz it is formed by interaction between positive and negative charges.its bond is much stronger than other bonds so it becomes difficult to break the ionic bond. By way of example, sodium chloride has a melting point of 801 ""^@C, sodium fluoride, 993 ""^@C, sodium bromide, 747 ""^@C, and sodium iodide, 661 ""^@C. This means that Ionic compounds will have a higher melting and boiling point. Ionic compounds usually form hard crystalline solids with high melting points. Ionic compounds have an equal number of positive and negative ions arranged in the three-dimensional lattice due to which they have high melting points.
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