J & K CET Medical J & K - CET Medical Solved Paper-2010

  • question_answer
    Out of the following, which is the correct set of quantum number for the outermost electron of potassium atom (Z = 19)?

    A)                 \[n\]      \[l\]        \[m\]     \[s\]                 4              3              2              -1/2

    B)                 4              2              0              -1/2

    C)                 4              1              0              +1/2

    D)                 4              0              0              -1/2

    Correct Answer: D

    Solution :

                    The electronic configuration of potassium is \[_{19}K=1{{s}^{2}},\text{ }2{{s}^{2}},\text{ }2{{p}^{6}},\text{ }3{{s}^{2}},\text{ }3{{p}^{6}},\text{ }4{{s}^{1}}\] For \[4{{s}^{1}},\] \[n=4\] \[l=0\] (\[\because \]For s orbital,\[l=0\]) \[m=0\]                 \[s=-\frac{1}{2}\]


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