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

  • question_answer The four quantum numbers of the valence electron of potassium are                                     [DPMT 2004]

    A)                 4, 1, 0 and \[\frac{1}{2}\]             

    B)                 4, 0, 1 and \[\frac{1}{2}\]

    C)                 4, 0, 0 and \[+\frac{1}{2}\]           

    D)                 4, 1, 1 and \[\frac{1}{2}\]

    Correct Answer: C

    Solution :

               Atomic number of potassium is 19 and hence electronic configuration will be \[1{{s}^{2}},\,2{{s}^{2}},\,2{{p}^{6}},\,3{{s}^{2}},\,3{{p}^{6}},\,4{{s}^{1}}\]                    Hence for \[4{{s}^{1}}\] electron value of Quantum number are                    Principal quantum number \[n=4\]                    Azimuthal quantum number \[l=0\]                    Magnetic quantum number \[m=0\]                                 Spin quantum number \[s=+1/2\]

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