3d & 4s  [ENDORSED]

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Junyong Wu
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3d & 4s

Postby Junyong Wu » Sun Oct 17, 2021 10:45 pm

So it will fill 4s first and then 3d except chromium and copper?
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Meg Yuan 1G
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Re: 3d & 4s  [ENDORSED]

Postby Meg Yuan 1G » Mon Oct 18, 2021 9:16 am

For multi-electron atoms after atomic number=20 (Calcium), 4s state is higher in energy than 3d, as we expect. So 3d will fill up after two electrons have occupied 4s state. Chromium and copper are two exceptions, correct.
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