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Question

Two p-block elements x(outer electronic configuration ns2, np3) and z (outer configuration ns2, np4) occupy neighbouring positions in a period. Using this information which of the following is correct with respect to their ionisation potential Ix  and Iz


  1. Iz  =  Ix

  2. Relation between Ix and Iz is uncertain

  3. Ix  >  Iz

  4. Iz  >  Ix


Solution

The correct option is C

Ix  >  Iz


x has stable electronic configuration due to half filled p-orbital so has more ionization energy than z.

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