4s state

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Nell Mitchell 1E
Posts: 31
Joined: Fri Sep 28, 2018 12:16 am

4s state

Postby Nell Mitchell 1E » Sun Oct 28, 2018 11:31 pm

I understand the rules with 4s and 3d but I don't conceptually understand why 4s is lower energy than 3d. Can someone explain?

Angel Chen 2k
Posts: 59
Joined: Fri Sep 28, 2018 12:20 am

Re: 4s state

Postby Angel Chen 2k » Sun Oct 28, 2018 11:39 pm

Because orbitals with a lower n+l value are filled first. For the 4s orbital, the n+l value is 4+0=4 , while for the 3d orbital , the n+l value is 3+2=5. This is why the 4s orbital is filled first.

Mukil_Pari_2I
Posts: 87
Joined: Fri Sep 28, 2018 12:29 am

Re: 4s state

Postby Mukil_Pari_2I » Sun Oct 28, 2018 11:39 pm

I am not 100% sure but I believe its because the Aufbau principle indicates that the 4s orbital fills before the 3d orbital and thus the energy is lower in the 4s.


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