Chemistry-
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Question

The order of magnitude of ionic radii of ions N a to the power of plus end exponent comma M g to the power of 2 plus end exponent comma A l to the power of 3 plus end exponent and S i to the power of 4 plus end exponent is

  1. (a) N a to the power of plus end exponent less than M g to the power of 2 plus end exponent less than A l to the power of 3 plus end exponent less than S i to the power of 4 plus end exponent  
  2. M g to the power of 2 plus end exponent greater than N a to the power of plus end exponent greater than A l to the power of 3 plus end exponent greater than S i to the power of 4 plus end exponent  
  3. (c) A l to the power of 3 plus end exponent greater than N a to the power of plus end exponent greater than S i to the power of 4 plus end exponent greater than M g to the power of 2 plus end exponent  
  4. N a to the power of plus end exponent greater than M g to the power of 2 plus end exponent greater than A l to the power of 3 plus end exponent greater than S i to the power of 4 plus end exponent  

The correct answer is: N a to the power of plus end exponent greater than M g to the power of 2 plus end exponent greater than A l to the power of 3 plus end exponent greater than S i to the power of 4 plus end exponent


    N a to the power of plus end exponent greater than M g to the power of 2 plus end exponent greater than A l to the power of 3 plus end exponent greater than S i to the power of 4 plus end exponent. All are isoelectronic but nuclear charge per electron is greatest for S i to the power of 4 plus end exponent. So it has smallest size and nuclear charge per electron for N a to the power of plus end exponent is smallest. So it has largest size.

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