Lower Energy State

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Xin Huang 3E
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Joined: Wed Sep 21, 2016 2:57 pm

Lower Energy State

Postby Xin Huang 3E » Fri Oct 28, 2016 9:33 am

On the Course Reader p. 29, it says we write "4s" before "3d" but says that after 4s state occupied and e- enter 3d state then 3d state is lower in energy than 4s. What does that mean... Why is this?

Posts: 7
Joined: Wed Sep 21, 2016 2:59 pm

Re: Lower Energy State

Postby KatrineEyer_1E » Fri Oct 28, 2016 10:12 am

Electron configurations blocks go from s, p, d, and then f. The 3d state is always lower in energy than 4s, but what gets filled first is the 4s state, hence why it is written first before the 3d state. It is to indicate that electrons must first occupy the s state before the d state.. This is likewise for the 4d and 5s states, and so on.

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