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JEE Main & Advanced Chemistry Structure of Atom / परमाणु संरचना Question Bank Atomic number, Mass number Atomic species

  • question_answer
    Which among the following species have the same number of electrons in its outermost as well as penultimate shell [DCE 2004]

    A)                 \[M{{g}^{2+}}\]               

    B)                 \[{{O}^{2-}}\]

    C)                 \[{{F}^{-}}\]       

    D)                 \[C{{a}^{2+}}\]

    Correct Answer: D

    Solution :

                \[_{20}Ca=2,\,\,8,\,\,8,\,\,2\]                    \[C{{a}^{2+}}=\] 2, 8, 8 Hence, \[C{{a}^{2+}}\] has 8 electrons each in outermost and penultimate shell.


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