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

  • question_answer According  to Aufbau's principle, which of the three \[4d,\,5p\]   and \[5s\]will be filled with electrons first           [MADT Bihar 1984]

    A)                 \[4d\]

    B)                 \[5p\]

    C)                 \[5s\]

    D)                 \[4d\] and \[5s\] will be filled simultaneously

    Correct Answer: C

    Solution :

                    According to the Aufbau?s principle, electron will be first enters in those orbital which have least energy. So decreasing order of energy is \[5p\,>\,4d>\,5s.\]

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