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J & K CET Medical J & K - CET Medical Solved Paper-2004

  • question_answer
    If elements with principal quantum number n > 4 were not allowed in nature, the number of possible elements would be :

    A)  60                                         

    B)  32

    C)  4                                            

    D)  64

    Correct Answer: A

    Solution :

                    Number of possible elements \[=2[{{1}^{2}}+{{2}^{2}}+{{3}^{2}}+{{4}^{2}}]\] \[=2(1+4+9+16)=60\]


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