Why do ionic compounds have high melting points?

Write symbols of cation and anion present in MgO. Why do ionic compounds have higher melting points ?

Generally the ionic compounds have high melting points

Generally the ionic' compounds have high melting points. Give reason

Give scientific reasons for the following: Generally the ionic compounds have high melting points .

Give reasons for the following : (i) Ionic compounds have high melting point and boiling point. (ii) Ionic compounds conduct electricity in molten state. (iii) Ionic compounds are solids at room temperature and are somewhat hard.