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

  • question_answer The electronic configuration of an element with atomic number 7  i.e. nitrogen atom is  [CPMT 1982, 84, 87]

    A)                 \[1{{s}^{2}},2{{s}^{1}},2p_{x}^{3}\]         

    B)                 \[1{{s}^{2}},2{{s}^{2}}2p_{x}^{2}2p_{y}^{1}\]

    C)                 \[1{{s}^{2}},2{{s}^{2}}2p_{x}^{1}2p_{y}^{1}2p_{z}^{1}\]               

    D)                 \[1{{s}^{2}},2{{s}^{2}}2p_{x}^{1}2p_{y}^{2}\]

    Correct Answer: C

    Solution :

                    \[_{7}N=1{{s}^{2}},2{{s}^{2}}2p_{x}^{1},\,2p_{y}^{1},\,2p_{z}^{1}\]. Hund?s rule states that pairing of electrons in the orbitals of a subshell (orbitals of equal energy) starts when each of them is singly filled.

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