Hund’s Rule - Please help explain below using Hunds rule? [closed]








**Closed.** This question is [off-topic](/help/closed-questions). It is not currently accepting answers.
 
 






---








 **Homework questions** must demonstrate some effort to understand the underlying concepts. For help asking a good homework question, see: [How do I ask homework questions on Chemistry Stack Exchange?](https://chemistry.meta.stackexchange.com/questions/141/how-do-i-ask-homework-questions-on-chemistry-stack-exchange)




Closed 12 months ago.








[Improve this question](/posts/168145/edit) 



Why is it easier to excite a 2s electron in a carbon atom to a 2p orbital than it would be to do the same in nitrogen?




The question is too simple, because nitrogen's 2s electrons have higher Zeff. Comparing carbon and nitrogen: when you increase 1 proton and 1 electon, the electron has some shiending effect, so while the effective positive charge increases 1, the effective negative charge can't reach 1. In conclusion, it's easier to promote 2s>2p in carbon than in nitrogen atoms.


Also, this video might help you:


<https://www.youtube.com/watch?v=dXOyNaxhc4A&list=PLavaRHHaRimXdmzRB21Ew9abP66YvxKzh>


 -1