JEE Main & Advanced Chemistry Structure of Atom Question Bank Quantum number, Electronic configuration and Shape of orbitals

  • question_answer The four quantum number for the valence shell electron or last electron of sodium (Z = 11) is [MP PMT 1999]

    A) \[n=2,\,l=1,\,m=-1,\,s=-\frac{1}{2}\]

    B)                 \[n=3,\,l=0,\,m=0,\,s=+\frac{1}{2}\]

    C)                 \[n=3,\,l=2,\,m=-2,\,s=-\frac{1}{2}\]

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

    Correct Answer: B

    Solution :

               \[N{{a}_{11}}=2,\,8,\,1\]\[=1{{s}^{2}},\,2{{s}^{2}}\,2{{p}^{6}},\,\,3{{s}^{1}}\]                 \[n=3,\,l=0,\,m=0,s=+1/2\]

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