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The ionic radii of N to the power of 3 minus end exponent, O to the power of 2 minus end exponent, F to the power of minus end exponent and N a to the power of plus end exponent follow the order

  1. N to the power of 3 minus end exponent greater than O to the power of 2 minus end exponent greater than F to the power of minus end exponent greater than N a to the power of plus end exponent    
  2. N to the power of 3 minus end exponent greater than N a to the power of plus end exponent greater than O to the power of 2 minus end exponent greater than F to the power of minus end exponent    
  3. N a to the power of plus end exponent greater than O to the power of 2 minus end exponent greater than N to the power of 3 minus end exponent greater than F to the power of minus end exponent    
  4. O to the power of 2 minus end exponent greater than F to the power of minus end exponent greater than N a to the power of plus end exponent greater than N to the power of 3 minus end exponent    

The correct answer is: N to the power of 3 minus end exponent greater than O to the power of 2 minus end exponent greater than F to the power of minus end exponent greater than N a to the power of plus end exponent


    As effective nuclear charge on N a to the power of plus end exponent is maximum. It has smallest size.

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