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  3. RAJASTHAN ­ PET

RAJASTHAN ­ PET Rajasthan PET Solved Paper-2002

  • question_answer
    Which of the following has\[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},\]\[3{{s}^{2}}3{{p}^{6}},4{{s}^{1}}\]configuration?

    A)  K                

    B)  \[Al\]

    C)  Na               

    D)  \[Ca\]

    Correct Answer: A

    Solution :

     Total number of electrons in an atom \[=2+2+6+2+6+1\] \[=19\] Hence, atomic number =19 The atomic number of potassium (K) is 19.


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