(a) Show the formation of Na_2Oby transfer of electrons between the combining atoms.(b) Why are ionic compounds usually hard ? (c) How is it that ionic compounds in the solid state do not conduct electricity and they do so when in molten state ?

(a) Show the formation of Na_2Oby transfer of electrons between the co

1.	(a) Show the formation of Na_2Oby transfer of electrons between the combining atoms.(b) Why are ionic compounds usually hard ? (c) How is it that ionic compounds in the solid state do not conduct electricity and they do so when in molten state ?
Answer» Solution :(a) FORMATION of `Na_2O`is shown below : (b) Ionic COMPOUNDS are usually hard because of strong force of ATTRACTION between the IONS. (c) Due to rigid structure in the solid state, movement of ions is not possible. HENCE, ionic compounds do not conduct electricity in the solid state. In the molten state, ions become mobile and conduct electricity.