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NEET Chemistry Structure of Atom / परमाणु संरचना NEET PYQ-Structure of Atom

  • question_answer
    \[B{{e}^{2+}}\] is isoelectronic with which of the following ions?                                          [AIPMT 2014]

    A)  \[{{H}^{+}}\]                       

    B)       \[L{{i}^{+}}\]

    C)  \[N{{a}^{+}}\]             

    D)  \[M{{g}^{2+}}\]

    Correct Answer: B

    Solution :

    Isoelectronic species contain same number of electrons. \[B{{e}^{2+}}\] contains 2 electrons. Among the given options, only \[L{{i}^{2+}}\] contains 2 electrons and therefore, it is isoelectronic with\[B{{e}^{2+}}\].
    \[{{H}^{+}}\to \]no electron; \[N{{a}^{+}}\to 10{{e}^{-}}\]
    \[L{{i}^{+}}\to 2{{e}^{-}};M{{g}^{2+}}\to 10{{e}^{-}}\]
    Hence, \[B{{e}^{2+}}\] is isoelectronic with\[L{{i}^{+}}\].


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