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DUMET Medical DUMET Medical Solved Paper-2009

  • question_answer
    It is believed that atoms combine with each other such that the outermost shell acquires a stable configuration of 8 electrons. If stability were attained with 6 electrons rather than 8; what would be the formula of the stable fluoride ion?

    A)  \[{{F}^{-}}\]              

    B)  \[{{F}^{+}}\]

    C)  \[{{F}^{2+}}\]              

    D)  \[{{F}^{3+}}\]

    Correct Answer: B

    Solution :

    If stability is attained with 6 electrons, the stable ion will contain 6 electrons in its valency shell... Electronic configuration of... [a] \[{{F}^{-}}=2,\,8\]          [b] \[{{F}^{+}}=2,\,6\] [c] \[{{F}^{2+}}=2,\,5\]          [d] \[{{F}^{3+}}=2,\,4\] Therefore, \[{{F}^{+}}\]ion will be the most stable ion.


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