JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2007

  • question_answer
    Which of the following sets of quantum numbers is correct for an electron in 4f orbital?

    A)  \[n=4,l=3,m=+4,s=+1/2\]

    B)  \[n=4,l=4,m=-4,s=-1/2\]

    C)  \[n=4,\text{ l}=3,m=+1,s=+1/2\]

    D)  \[n=3,l=2,\text{ }m=-2,\text{ s}=+1/2\]

    Correct Answer: C

    Solution :

                    Any sub-orbit is represented as\[nl\]such that n is the principal quantum number (in the form of values) and I is the azimuthal quantum number (its name). Value of \[l<n,\text{ }l\,\,\,\,0\,\,\,\,1\,\,\,\,\,2\,\,\,\,3\,\,\,\,4\]                                                      \[s\text{ }\,p\text{ }\,d\text{ }\,\,f\,\,g\] Value of m:  \[-l.-l+1.......\text{ }0,........+Z\] Value of s:           \[+\frac{1}{2}or-\frac{1}{2}\] Thus for\[4f:n=4,\text{ }I=3,\text{ }m=\] any value between\[-3\]to + 3.


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