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  4. The orbital diagram in which the Aufbau principle violated is <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/chemistry/2ab1ebc813d140fc2284198aa1310bea-.jpeg />

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Q. The orbital diagram in which the Aufbau principle violated is
image

Structure of Atom

Solution:

According to Aufbau principle, the orbital of lower energy (2s) should be fully filled before the filling of orbital of higher energy starts.