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BCECE Engineering BCECE Engineering Solved Paper-2009

  • question_answer
    The successive ionization energies of an element are 800, 2,000, 3,600, 25,000 and 32,000 kJ/mol. The number of valence electrons are

    A)  5                            

    B)         2                            

    C)  3                            

    D)         4

    Correct Answer: C

    Solution :

    Since there is a sudden increase in the ionization energy after third ionization (ie, after the removal of third electron) the number of valence electrons is 3.


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