When 3d orbital is complete, the new electron will enter the

When 3d orbital is complete, the new electron will enter the

  1. A

    4p -orbital 

  2. B

    4f -orbital 

  3. C

    4s -orbital 

  4. D

    4d -orbital

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    Solution:

    According to the Aufbau's principle the new electron will enter in those orbital which have least energy. So here 4p -orbital has least energy than the others except  4s.

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