Why is sodium chloride actually (Na+Cl-) n and not NaCl ?

In sodium chloride, a large number of sodium ions (Na⁺) and chloride ions (Cl^–) are arranged in three dimensions such that each Na⁺ is surrounded by six Cl^– and each Cl^– is surrounded by six Na^+. Thus, in sodium chloride, Na⁺ will have Cl^– as its nearest neighbor. A two-dimensional arrangement of ions in sodium chloride crystal.

There is no discrete molecule like NaCl in the crystal. Crystal of sodium chloride is electrically neutral. So, the numbers of Na+ and Cl- ions in sodium chloride crystal are equal. As a result, a crystal of sodium chloride can only be described as (Na⁺Cl^–) n and not as Na⁺Cl^– , or NaCl.