JIPMER Jipmer Medical Solved Paper-1998

  • question_answer
    The correct order of first ionization energy is:

    A)  \[Be<B<N<O\]

    B)         \[B<Be<N<O\]

    C)         \[B<Be<O<N\]

    D)        \[O<N<B<Be\]

    Correct Answer: C

    Solution :

    lionization energy generally increase from left to right in a period. Hence expected increasing order is Be, B, N, O but the actual order, found is: B < Be < O < N The reason is that Be and N, have comparatively     stabler     electronic configurations (\[n{{s}^{2}}\] and \[n{{p}^{3}}\]) than those of B and O (\[n{{p}^{1}}\] and \[n{{p}^{4}}\]). Hence, their ionisation energy becomes higher.


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