Ionic Bond

    A bond formed by the complete transference of electron from one atom to another is called as electrovalent or ionic bond.It is a type of chemical bond in which the electrostatic atrraction exists between oppositely charged ion. Element which have the tendency to loose the electron is called electropositive element (generally metal ) and the element which have the tendency to gain the electron is called electronegative element ( generally non -metal ) and forms cation and anion respectively.Hence, electrostatic force of attraction exist between two oppositely charged particle ( cation and anion ) is called ionic bonding.
                          To form the ionic bond ,there must be greater difference of electronegativity between two combining molecule.All the ionic compound have some of the character of covalent bonding.Thus, ionic bonding is seen only when the ionic character of atom should be greater than covslent character.Bond with partial or equal character of both ionic and covalent character are called polar covalent bond.        
        Formation of NaCl takes place only when electropositive element Na loose its valence electron and Na+ ion (cation) and the electronegative element Cl- ion accept that electron to forms chloride ion to attain the stable nearest noble gas configuration.

     Ionic compound have high melting and Boiling point. This is due to the strong force of attraction between two oppositely charged particle.Solid Crystalline compound of ionic compound do not conduct heat and electricity due to absence of free electron.