Question about 4s and 3d orbitals

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Bingcui Guo
Posts: 30
Joined: Fri Sep 28, 2018 12:19 am

Question about 4s and 3d orbitals

Postby Bingcui Guo » Thu Oct 25, 2018 9:35 am

I know that 4s shows lower energies than 3d orbital so the electrons will fill the 4s first. But why after 2e- occupied the 4s orbitas, 4s states lower energy?
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Daniel Lai
Posts: 65
Joined: Fri Sep 28, 2018 12:28 am

Re: Question about 4s and 3d orbitals

Postby Daniel Lai » Thu Oct 25, 2018 11:32 am

The 4s orbital is only less in energy when there are no electrons in 3d. But, once 4s and 3d are filled, 4s is higher in energy, so it is the first to lose electrons.
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