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

  • question_answer
    Chromium has the electronic configuration \[4{{s}^{1}}3{{d}^{5}}\] rather than \[4{{s}^{2}}3{{d}^{4}}\] because

    A)                 \[4s\] and \[3d\] have the same energy

    B)                 \[4s\] has a higher energy than \[3d\]

    C)                 \[4{{s}^{1}}\] is more stable than \[4{{s}^{2}}\]

    D)                 \[4{{s}^{1}}3{{d}^{5}}\] half-filled is more stable than \[4{{s}^{2}}3{{d}^{4}}\]

    Correct Answer: D

    Solution :

                    \[Cr\] has \[\left[ Ar \right]\,4{{s}^{1}}3{{d}^{5}}\] electronic configuration because half filled orbital are more stable than other orbitals.

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