Orbital diagram in which the Aufbau principle is violated [closed]








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> 
> The orbital diagram in which the Aufbau principle is violated is:  
> 
> [![enter image description here](https://i.stack.imgur.com/q9MHv.png)](https://i.stack.imgur.com/q9MHv.png)
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> 
> 


The answer given for this question is **3**, but according to me if asked for Hund's rule violation then it would be **1**, as electrons are not distributed among the subshell in such a way to give maximum number of unpaired electron with parallel spin.




The answer is 3 because according to Aufbau principle electrons are distributed according to energy levels that means S orbital should be filled completely before starting P . This doesn't happen in case 3 ,hence it is the answer.


 1