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JEE Main & Advanced AIEEE Solved Paper-2003

  • question_answer
    Which one of the following group represents a collection of isoelectronic species? (At. no. Cs-55. Br-35)     AIEEE  Solved  Paper-2003

    A)                         \[N{{a}^{+}},C{{a}^{2+}},M{{g}^{2+}}\]

    B)       \[{{N}^{3-}},{{F}^{-}},N{{a}^{+}}\]

    C)       Be, \[A{{l}^{3+}},C{{l}^{-}}\]      

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

    Correct Answer: B

    Solution :

    \[{{N}^{3-}}7+3=10\] electrons \[{{F}^{-}}9+1=10\] electrons              \[N{{a}^{+}}11-1=10\] electrons


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