The orbital diagram in which the Aufbau principle is violated is:
enter image description here

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.


closed as unclear what you're asking by Mithoron, bon, Jan, airhuff, pentavalentcarbon Oct 22 '17 at 14:01

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ Ok. So what is your question? $\endgroup$ – Tan Yong Boon Oct 22 '17 at 8:35
  • $\begingroup$ That's the ground state for carbon. The pairing energy is lower than the difference between $2s$ and $2p$, so you definitely pair in $2s$ before moving up to $2p$. $\endgroup$ – Zhe Oct 22 '17 at 12:15
  • $\begingroup$ But you’re not being asked for Hund’s rule violation …? $\endgroup$ – Jan Oct 22 '17 at 13:20
  • $\begingroup$ None of these violate Hund's rule. Aufbau is violated in 3 because $s$ was not filled before moving on to $p$. $\endgroup$ – Zhe Oct 22 '17 at 20:53

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.


Not the answer you're looking for? Browse other questions tagged or ask your own question.