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NEET Sample Paper NEET Sample Test Paper-6

  • question_answer
    The order of first ionization energies of the elements \[Li,\text{ }Be,\text{ }B,\text{ }Na\] is:

    A)  \[Li>Be>B>Na\]

    B)  \[Be>B>Li>Na\]

    C)  \[Na>Li>B>Be\]

    D)  \[Be>Li>B>Na\]

    Correct Answer: B

    Solution :

    Ionization energy increases in a period on moving left to right while it decreases in a group on moving downward. The I.E. of Be is greater than B due to completely filled s-orbital. Therefore the order of first ionization energies is as: \[Be>B>Li>Na\]


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