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JEE Main & Advanced Chemistry Structure of Atom / परमाणु संरचना Question Bank Self Evaluation Test - Structure of Atom

  • question_answer
    Which of the following should be the number of electrons present in \[{{X}^{2+}}\]on the basis of electronic configuration, if the ion \[{{X}^{3-}}\]has 14 protons?

    A) 12  

    B) 14  

    C) 16        

    D) 18

    Correct Answer: A

    Solution :

    [a] \[{{X}^{3-}}\] has 14 protons, i.e., X also has 14 protons and therefore 14 electrons. \[X=14=1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{2}}\] \[{{X}^{2+}}=1{{s}^{2}},2{{s}^{1}}2{{p}^{6}},3{{s}^{2}}=12\]electrons


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