11th Class Chemistry Structure of the Atom Question Bank 11th CBSE Chemistry Structure of the Atom

  • question_answer
    What is the deviation from Aufbau Principle in case of electronic configuration of La (Z = 57)?

    Answer:

                    The electronic configuration of La(Z = 57) is:\[[Xe]\,5{{d}^{1}}\,6{{s}^{2}}\]. It deviates from the Aufbau principle in the sense that the electron enters 5d orbital in preference of 4f orbital which is of lower energy.


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