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Manipal Engineering Manipal Engineering Solved Paper-2011

  • question_answer
    An element M has an atomic mass of 19 and atomic number 9, its ions is represented by

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

    B) \[{{M}^{2+}}\]

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

    D)        \[{{M}^{2-}}\]

    Correct Answer: C

    Solution :

    Configuration of an element\[_{9}M=1{{s}^{2}},\,\,2{{s}^{2}},\,\,2{{p}^{5}}\]. Hence, its ion will be\[{{M}^{-}}\]because it can easily gain one electron to have octet.


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