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RAJASTHAN ­ PET Rajasthan PET Solved Paper-2001

  • question_answer
    If elements with quantum number n > 4 are not in the nature, the number of possible elements is

    A)  60              

    B)  32

    C)  4               

    D)  64

    Correct Answer: A

    Solution :

     For\[n=1,\]the maximum number of energy level\[=2{{n}^{2}}=2\]and for\[n=2,3,4,\]the maximum number of energy levels will be 8, 18, 32 respectively. Therefore number of elements \[=2+8+18+32=60\]


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