Ionic compounds are species that have cations and anions in them. The chloride salts of magnesium have a high melting point because of the high heat required to break the compound.
Ions are the charged species that have an unequal number of protons in their nucleus and electrons in the outer shells. Magnesium ions lose two electrons and become positively charged.
This positive charge has a strong force of attraction that needs more amount of energy to overcome the electrostatic force of attraction. Hence, the chloride salts of magnesium and sodium require high energy.
Therefore, magnesium chloride has a high melting point.
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