Why is coordination number 12 not found in ionic crystals?
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Maximum radius ratio in ionic crystals lies in the range 0.732 - 1 which corresponds to a coordination number of 8. Hence, coordination number greater than 8 is not possible in ionic crystals.
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Coordination number of 12 is not found in ionic crystals because of the radius ratio range. The maximum radius ratio in ionic crystals is in the range 0.732 to unity. This range corresponds that maximum coordination number in any ionic crystal can be 8.
Hence, any ionic crystal cannot exhibit a coordination number of 12.
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