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

  • question_answer
    An element has the electronic configuration \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{2}}\]. Its valency electrons are [NCERT 1973]

    A)                 6             

    B)                 2

    C)                 3             

    D)                 4

    Correct Answer: D

    Solution :

                    An element has the electronic configuration \[1{{s}^{2}},\,2{{s}^{2}}\,2{{p}^{6}},\,\,3{{s}^{2}}\,3{{p}^{2}},\,(Si)\]. It?s valency electrons are four.


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