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JEE Main & Advanced Chemistry Classification of Elements and Periodicity in Properties / तत्त्वों का वर्गीकरण एवं गुणों में आवर्ति Question Bank Ionisation Energy

  • question_answer
    The correct sequence of elements in decreasing order of first ionisation energy is [MP PET 1997]

    A) \[Na>Mg>Al\]

    B) \[Mg>Na>Al\]

    C) \[Al>Mg>Na\]

    D) \[Mg>Al>Na\]

    Correct Answer: D

    Solution :

    \[Mg>Al>Na\]. This is due to the presence of fully filled s-orbital in Mg.


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