Answer :
Final answer:
Magnesium oxide (MgO) exhibits an ionic crystal structure and has a high melting point of 3125 K due to the strong electrostatic forces of attraction between its ions.
Explanation:
Magnesium oxide (MgO) has a melting point of 3125 K. The type of crystal structure in magnesium oxide is ionic crystal structure. The high melting point of magnesium oxide can be attributed to the strong electrostatic forces of attraction between the positively charged magnesium ions and the negatively charged oxide ions.
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