![]() Of six if the radius ratio were exactly 0.414. Would fit exactly into the octahedral void and would have a coordination number The radius ratio at which anions just touch each other, as well as central cation, is called the critical radius ratio.Įffect of Radius Ratio on Coordination Number:.Hence the structure changes to some suitable stable arrangement. In such case packing of anions is very close to each other and due to repulsion between anions, the system becomes unstable. If cations are extremely small and anions are extremely large, then the radius ratio is very small.Greater the radius ratio, greater is the coordination number of cations and anions.In crystals, cations tend to get surrounded by the largest possible number of anions around it.The structure of an ionic compound depends upon stoichiometry and the size of ions. ![]() It is useful in predicting the structure of ionic solids.
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