Answer:
The two-dimensional crystal is shown in the attached file.
Explanation:
The two-dimensional crystal that contains six formula units of sodium chloride in the solid state is shown in the attached file. In the two-dimensional crystal, there are ion pointing outward and there are others pointing inward. Each sodium ion in the crystal is surrounded by 6 chloride ions. Similarly, each chloride ion in the crystal is also surrounded by 6 sodium ions. Due to this arrangement, the number six (6) is commonly known as the the coordination number of sodium and chloride ions.
