Answer: Ionic compounds include sodium chloride (NaCl) and table salt. It implies that each cation would be associated with exactly one anion, implying that the cation Na+, as well as the anion Cl–, have the same count of coordinates.
Each Na+ ion has a Cl– neighbour below and above, towards the right and the left, and the front and the back in the NaCl structure. The same holds for Cl– ion. The coordinating number for both ions is 6.
In a crystal of NaCl, each sodium atom is surrounded by 6 chloride ions, so each ion of chloride is encircled by 6 sodium ions. As a consequence, the coordination amount of NaCl would be defined as 6:6.