AFMC AFMC Solved Paper-2007

  • question_answer
    Which one of the following elements has the highest ionisation energy?

    A) \[[Ne]3{{s}^{2}}3{{p}^{1}}\]                       

    B) \[[Ne]3{{s}^{2}},3{{p}^{2}}\]

    C) \[[Ne]3{{s}^{2}}3{{p}^{3}}\]                       

    D) \[[Ar]3{{d}^{10}}\,4{{s}^{2}}4{{p}^{2}}\]

    Correct Answer: C

    Solution :

    The energy is required to remove an electron from the outermost orbit of an atom is known as ionization energy. \[P-[Ne]3{{s}^{2}}3{{p}^{3}}\] The outermost p subshell of phosphorus is half filled and half filled orbitals are more stable. Therefore, it is comparatively difficult to remove the electrons from half filled subshell.


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