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CMC Medical CMC-Medical VELLORE Solved Paper-2013

  • question_answer
    Suppose that the electron spin quantum number could have three possible values which of the following atomic numbers would not correspond to a noble gas?

    A)  3                                            

    B)  15     

    C)  27                         

    D)  42

    Correct Answer: D

    Solution :

                     If an electron can have three values of spin quantum numbers,, an orbital could occupy a maximum of 3 electrons rather than 2 under present conventions Hence, in that case a period could accommodate\[\frac{3}{2}\]times the element present now. Hence, the atomic number of noble gases under this convention would be 3, 15, 27, 54, etc.


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