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NEET Sample Paper NEET Sample Test Paper-66

  • question_answer
    An element with atomic number 20 will be placed in which period of the periodic table

    A) 4                                 

    B) 3

    C) 2                                 

    D) 1

    Correct Answer: A

    Solution :

    \[1{{s}^{2}}\,2{{s}^{2}}\,2{{p}^{6}}\,3{{s}^{2}}\,3{{p}^{6}}\,4{{s}^{2}}\] principal quantum no. is 4 so it belongs to 4th period.


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