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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 17

  • question_answer
    An element X belongs to fourth period and fifteenth group of the periodic table. Which of the following statements is true?

    A) It has a completely filled s-orbital and a partially filled d-orbital.

    B) It has completely filled s-and p-orbitals and a partially filled d- orbital.

    C) It has completely filled s-and p-orbitals and a half-filled s-orbital.

    D) It has a half-filled p-orbital and completely filled s-and d-orbitals.

    Correct Answer: D

    Solution :

    [d]: Element X belongs to fourth period and fifteenth group.
    Period 1 2 3 4
    Group 15 Ni] N(7) P(15) As(33)
    Let us configure As(33). Now, \[As\left( 33 \right)\to \text{1}{{5}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}3{{d}^{10}}4{{s}^{2}}4{{p}^{3}}\] So, 5 and d-orbitals are fully-filled and p-orbital is half-filled.


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