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    Question

    Based on the periodic trends for ionization energy,

    which element has the highest ionization energy?
    A Bromine Correct Answer Incorrect Answer
    B Fluorine Correct Answer Incorrect Answer
    C Helium Correct Answer Incorrect Answer
    D Nitrogen Correct Answer Incorrect Answer

    Solution

    Based on periodic trends, helium (He) has the highest ionization energy. This is because ionization energy generally increases across a period from left to right and decreases down a group. Helium, being in the top-right corner of the periodic table, has a small atomic size and a high effective nuclear charge, leading to a very high ionization energy.

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