Sodium chloride (NaCl) or table salt is an ionic compound. It means that each cation will have exactly one anion associated with it, which means the cation Na+ and the anion Cl− have the same number of coordinates. The NaCl structure shows each Na+ ion having a Cl− neighbour above and below, to the left and to the right and to the front and to the rear. The concept is true for cl– ion also. For both ions, the coordinating number is 6.