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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
    Order of first ionization potentials of elements Li, Be, B, Na is [Kerala CET 2005]

    A) Li > Be >B > Na

    B) Be >B > Li > Na

    C) Na > Li > B > Be

    D) Be > Li > B > Na

    E) B > Be > Li > Na

    Correct Answer: B

    Solution :

    Ionization potential increases as we go from left to right in a period, while it decreases as we come down a group. Be        B        Li        Na 9.3      8.3      5.4      5.1


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