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JEE Main & Advanced Physics Atomic Physics Question Bank Atomic Structure

  • question_answer
    As per Bohr model, the minimum energy (in eV) required to remove an electron from the ground state of doubly ionized Li atom (Z = 3) is                                 [IIT 1997 Re-Exam; MH CET 2000]

    A)            1.51                                          

    B)            13.6

    C)            40.8                                          

    D)            122.4

    Correct Answer: D

    Solution :

                       \[E=-{{Z}^{2}}\times 13.6\ eV\]\[=-9\times 13.6\ eV=-122.4\ eV\]            So ionisation energy = + 122.4 eV.


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