Banking Chemistry Classification of Elements and Periodicity in Properties Question Bank Classification of Elements and Periodicity in Properties

  • question_answer An element 'M' has an atomic number 9 and its atomic mass 19. The ion of M will be represented by

    A)  M                   

    B)  \[{{M}^{2+}}\]

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

    D)         \[{{M}^{2-}}\]

    Correct Answer: C

    Solution :

     The electronic configuration of M is 2, 7. It needs one electron to complete its octet. It has a strong tendency to gain 1 electron and so its ion will be.  \[{{M}^{-}}\].

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