Answer to Question #55650 in Physical Chemistry for Misha Jain
In general, sodium cation can reveal the coordination number of 4 and 6 in its compounds. However, for the type A2B, it is found in the tetrahedral coordination environment (Coordination number is 4). This is determined by the ratio of radii of sodium cation and oxygen anion as well as their charges.
For instance, if sodium had the coordination number of 6, the oxygen would show the coordination number of 12. It is impossible because oxygen can only show the maximal number which equals 8.
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