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

  • question_answer An atom has 2 electrons in \[K\] shell, 8 electrons in \[L\] shell and 6 electrons in \[M\] shell. The number of \[s\]-electrons present in that element is            [CPMT 1989]

    A)                 6             

    B)                 5

    C)                 7             

    D)                 10

    Correct Answer: A

    Solution :

               Shell = K, L, M    = \[1{{s}^{2}}\] \[2{{s}^{2}}2{{p}^{6}}\] \[3{{s}^{2}}3{{p}^{4}}\]                 Hence the number of s electron is 6 in that element.

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